The Stena Don is a harsh environment dynamically positioned Class 3 semi submersible drilling, completion and workover vessel for worldwide operations. The name of the rig was the Blue Water Rig No. The USS Monitor was an antecedent to such craft with its low-profile deck and gun turret. Hai Yang Shi 278). The passenger cabin is deep in the hull, a few meters below the waterline. They have good ship … Ship Photo Roster Thousands of ships and the only photographer! As a related development, the hybridization of submarines to acquire certain surface ship attributes has included the augmentation of firepower and surface speed. 255m (837ft) Breadth. The most common design is similar to a ship. In addition, Semi submersible ships are also used as heavy duty cranes. There are selected ports and carriers that offer this service. With 11 vessels in operation, Boskalis is the global heavy marine transport leader. If you continue to use this site we will assume that you are happy with it. Download PDF About Wärtsilä. A heavy-lift ship is a vessel designed to move very large loads that cannot be handled by normal ships. Falcon, IMO 7915280, Call sign LAIP6, Semi submersible ships - Ship Photos and Ship Data Ship Photo Roster Thousands of ships and the only photographer! These huge semi-submersible ships began appearing in the early '80s. Semi-submersible (“semi”) rigs float like a ship while being towed into position, where their pontoons can then be flooded, partially submerging the rig. World largest semi-submersible cargo transport ship - Duration: 0:42. World largest semi-submersible cargo transport ship - Duration: 0:42. Before the advent of nuclear power, submarines were slower on the surface than surface ships and even slower underwater. The operation could take a number of days to complete. [1] Its low-freeboard deck—only 18 inches (46 cm) above the water—with a single gun turret gave it the appearance of a "cheesebox on a raft", according to observers of the time. Figure 5-4 illustrates a typical semi-submersible. The barge has a Submersible depth of 17 m, which allows even very large deep cargoes to be floated on & off safely Main Features Deadweight (cargo capacity) : 21,000 t Deck […] These specialised barges are equipped with pumping towers. They were generally slower to dive and offered a bigger sonar signature than conventional submarines. News Direct 190,653 views. 5000 ships and 16063 photos online The Vanguard is our latest state-of-the-art semi-submersible heavy transport vessel. Someone call 911, there’s a ship sinking in the harbor but nobody seems to care! Falcon, IMO 7915280, Call sign LAIP6, Semi submersible ships - Ship Photos and Ship Data Ship Photo Roster Thousands of ships and the only photographer! It displaces 80,000 pounds (36 t) and is powered by two ten-cylinder, 1,500-horsepower (1,100 kW) diesel engines. As a farewell gift, the ship was handed a … Examples are:[9]. Because the main part of the structure is beneath the sea surface, semis are not as susceptible to wave actions as drilling ships. Deepsea Delta semi-submersible drilling rig in the North Sea. They are of two types: Semi-submersible ships that take on water ballast to allow the load—usually another vessel—to be floated over the deck, whereupon the ballast is jettisoned and the ship's deck and cargo raised above the waterline. Ship Photo Roster Thousands of ships and the only photographer! Dry cargo ships. A Semi-Submersible Rig or a “Semi-Sub” or a “Semi” or a “Floater” is a drilling rig that is used to drill wells in water depths inaccessible to jack-up rigs (water depths greater than 400 ft).Semi-submersible rigs are buoyant and, unlike jack-up rigs which rest on the seabed, float during drilling operations. It's the first time such a heavy duty operation has been conducted in the Black sea. Semi-submersible ships. see Heavy lift ships. The barge has a Submersible depth of 17 m, which allows even very large deep cargoes to be floated on & off safely. Main page Photos Ships Categories Map. Ships for Sale is one of the world’s largest web portals dedicated to the sale and purchase of commercial vessels of all types and sizes. All categories. 4987 ships and 16025 photos online [5], In 2002, North Korea delivered five Taedong semi-submersible vessels to the Iranian Navy as part of an arms shipment that included other types of gunboats and patrol boats. After the cargo is fully loaded into the loading area, the loading area (deck) is raised once again out of the water and the semi-submersible ship along with its cargo makes its journey to the specified destination. This allows the barge to submerge below the surface and for the cargo to be floated onto the deck before the barge is de-ballasted and raised, with the cargo, above the water once again. On Thursday the Barkly Pearl was loaded on to an enormous, semi-submersible ship carrier to begin its journey home. Semi-Submersible and Heavy Lift Ships Design features, Uses and Risk Factors. Semi Submersible Shipping Services From the water to the water is a service for super yachts and vessels that cannot be lifted on to the carrier. They are of two types: Semi-submersible ships that take on water ballast to allow the load—usually another vessel—to be floated over the deck, whereupon the ballast is jettisoned and the ship's deck and cargo raised above the waterline. Our Ship Delivery Services include own keel transport, heavy lift, towage and semi-submersible transport. Main page Photos Ships Categories Map. Any cargo which is heavy or super heavy (which needs a semi submersible operation) and which needs a fast transportation over sea then semi submersible vessels are ideal for movement. Main page Photos Ships Categories Map. Semi-submersible ships. Multipurpose ships. Semi submersible ships - Ship Photos and Ship Data. Video of a Semi-Submersible Ship's Dramatic Cargo Dumping By Rain Noe - January 17, 2014. In simple terms, the semi-submersible vessel is supported by way of pontoons which are located under the water surface. Heavylift Falcon. The Xiang Rui Kou and Xiang Yun Kou have been fitted with a portable class 2 DP system. [7] The SEALION is reportedly a semi-submersible with a planing hull for surface running and ballast tanks to run with a reduced profile. The Blue Marlin, and her sister ship Black Marlin, are two of the most advanced. The ship was abandoned when it was discovered by the Guatemalan National Civil Police about 23 miles off the coast of Guatemala, between the Sipacate and Nahualate Rivers. The 98,000dwt heavy-lift vessel is the second largest of its type in the world, after Dockwise Vanguard. But later on as the need was felt for rigs which could be operated in more depths, the invention of the marine equipment developed and widened, The first recognised and acknowledged semi-submersible vessel was the one launched by the Blue Water Drilling Company in the year 1961. It can fix the Fitz where it sits, or carry it home aboard one of the funkiest vessels on the seven seas: a semi-submersible, heavy lift ship big enough to carry another ship. Dear Sir/Madame View the semi-submersible barges we have available for sale for use in flo-flo transport. Semi-submersible vessel is majorly used in marine operations carried out in the high seas like oil drilling and production platforms for oil. Select. Download PDF ... see Heavy lift ships. The I-SILC model was the first semi-submersible, which could submerge to snorkel depth to power its combustion engine. Ships for Sale is one of the world’s largest web portals dedicated to the sale and purchase of commercial vessels of all types and sizes. Semi-submersible (“semi”) rigs float like a ship while being towed into position, where their pontoons can then be flooded, partially submerging the rig. **Learn To Do Troubleshooting And Maintenance Of Marine Electrical Systems**        Click Here To Know How, By sharda | In: Types of Ships | Last Updated on November 8, 2019. One of the most important advantages of a semi-submersible ship is that it helps to haul seemingly large cargo. The Vanguard can be used as an offshore dry dock facility too. Comparison of deepwater semi-submersible and drillship. Semi-submersible vessel is majorly used in marine operations carried out in the high seas like oil drilling and production platforms for oil. Royal Australian Navy 234,327 views. The Monitor is noted for its role in the Battle of Hampton Roads in 1862, when it fought indecisively against the casemate ironclad, CSS Virginia. Keta was built in 1904 in St. Petersburg, powered by a 14-horsepower (10 kW) motor, displacing 8 tons, and with a length of 7 metres (23 ft). Xin Guang Hua Semi-Submersible Vessel. Select. April 2016. It used a ballast tank (submersion control) to keep it at about 30 m under water while being towed by a … Such rigs could be used in water levels up to 30 metres. Cruiser submarines combined of the stealth of a submarine with the endurance and firepower of a surface ship; several were the largest submarines built at the time of their launching. The Dockwise operated Vanguard semi-submersible heavy lift ship is the largest vessel of its type ever built. On Thursday the Barkly Pearl was loaded on to an enormous, semi-submersible ship carrier to begin its journey home. The existing and future semi-submersible ships are compared in the figure 10 which shows the main particulars of each of the individual ships (or series of ships in case of sister ships). This is the most important factor that makes these vessels indispensable in important marine operations. A semi-submersible platform is a specialised marine vessel used in offshore roles including as offshore drilling rigs, safety vessels, oil production platforms, and heavy lift cranes. US Navy 080914-N-8310C-003 The guided-missile frigate USS McInerney (FFG 8) tows a self-propelled, semi-submersible craft seized Saturday, Sept. 13, 2008 by Coast Guard Law Enforcement Detachment 404.jpg 1,500 × 2,437; 2.56 MB. Figure 5-4 illustrates a typical semi-submersible. Required fields are marked *, Semi-Submersible Ships and Semi-Submersible Rigs: A General Overview, Construction and Development of a Semi-submersible Vessel. Russian and North Korean semi-submersible naval vessels evolved from torpedo boats and special forces boats that could partially submerge (sometimes to snor… With the help of marine technology like the semi-submersible vessel, a lot of marine operations are carried out with the least amount of problems. Some of these cookies also help improve your user experience on our websites, and assist with navigation and your ability to provide feedback. The cargo carrying area of the semi-submersible ship is submersed under the water with the help of the ballast tanks. As an international shipbuilder Damen has extensive knowledge of each vessel and of transport contracts and conditions, and we have many years’ experience of shipping to distant and remote destinations. Russian and North Korean semi-submersible naval vessels evolved from torpedo boats and special forces boats that could partially submerge (sometimes to snorkel depth) to perform their missions. [2] The designer, John Ericsson, had deliberately minimized the observable surface of the vessel and the area that it presented as a target. Transshelf. In addition, Semi submersible ships are also used as heavy duty cranes. Royal Australian Navy 234,327 views. Thunder Hawk hull.jpg 3,072 × 2,304; 2.51 MB. How semi-submersible barges operate. ‘Dockwise Vanguard’) Semi-Submersible Heavy Transport Vessel. Someone call 911, there’s a ship sinking in the harbor but nobody seems to care! Compared are: a) Deck length, b) Beam, c) Deadweight, and d) Water over deck. View the semi-submersible barges we have available for sale for use in flo-flo transport. They were designed to attack merchant marine shipping with heavy deck guns, as well as torpedoes. Approaching its insertion point, the vessel operates as a planing power boat. They have good ship stability and seakeeping, better than drillships. They have good ship stability and seakeeping, better than drillships. Semi-submersible platform Last updated August 19, 2020 Deepsea Delta semi-submersible drilling rig in the North Sea Comparison of deepwater semi-submersible and drillship. In this situation, your boat will be moved from the water onto the carrier vessel for placement and strapping while still afloat. Our references include world-famous heavy-lift vessels such as the Boka Vanguard (formerly Dockwise Vanguard) and the White Marlin.Our own 50,000 DWT SSHLV design is a proven workhorse of the oceans with various units already built (see e.g. Its dimensions are 80 feet (24 m) long, 14.5 feet (4.4 m) abeam, and 9.5 feet (2.9 m) from keel to cabin roof. A semi-submersible is a specialised marine vessel with good stability and seakeeping characteristics. A semi-submersible naval vessel is a hybrid warship, that combines the properties of a surface ship and submarine by using water ballast to partially immerse and minimize its above-waterline profile, thereby improving its stealth characteristics when in hostile waters. Construction and Development of a Semi-submersible Vessel: The semi-submersible vessel was developed because of the need for vessels that could stay afloat and carry out their required functions in the high seas amidst the constant movement of the waves. In simple terms, the semi-submersible vessel is supported by way of pontoons which are located under the water surface. We use cookies to personalize content and ads, to provide social media features and to analyse our traffic. Submarines are human-occupied pressure … 68m (223ft) Launched. Over the submersed pontoons, there are steel columns which provide support to the semi-submersible vessel, The anchoring of the semi-submersible vessel is provided by way of anchors attached to cables and wires in a set of 6 to 12, Since the operating area of the semi-submersible rigs are located quite high from the submersible pontoons, there is no danger of the big ships collapsing into the water. A heavy-lift ship is a vessel designed to move very large loads that cannot be handled by normal ships. The terms semisubmersible, semi-sub or just semi are also generally used for this vessel design. The BOKA Vanguard, pictured, is the world’s largest semi-submersible dry dock capable of carrying a cruise liner London: George Harrap, United States Naval Special Warfare Command, "N. Korea delivers semi-submersible gunships to Iran", "Проект 1231 опытного малого погружающегося ракетного корабля", Russian patent for a "Surface-underwater ship", https://en.wikipedia.org/w/index.php?title=Semi-submersible_naval_vessel&oldid=995952868, Creative Commons Attribution-ShareAlike License, This page was last edited on 23 December 2020, at 19:19. as a Semi-Submersible Subchapter T Passenger Carrying Vessel. Deltamarin is one of the world’s leaders in designing complex semi-submersible heavy-lift vessels (SSHLV). About The Webinar. The Vanguard mostly transports offshore oil and gas installations, but also moves other ships. Length. The US Navy SEALs use such vessels for clandestine special forces actions. The Vanguard can be used as an offshore dry dock facility too. Keta was followed by other designs, "Variant D" and "Type F". Select. LHD arrival in Port Phillip Bay - Duration: 1:17. 4808 ships and 15299 photos online. Continue Reading ‘Boka Vanguard’ (ex. By emphasising sustainable innovation, total efficiency and data analytics, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers. Semi-submersible may refer to a self-propelled vessel, such as: Heavy-lift ship, which partially submerge to allow their cargo (another ship) to float into place for transport; Narco-submarine, some of which remained partially on the surface; Semi-submarine, which cannot fully submerge World’s biggest semi-submersible lifts an entire cruise ship out of the water so it can be taken for repairs in stunning 12-hour operation. A heavy-lift ship is a vessel designed to move very large loads that cannot be handled by normal ships. How semi-submersible barges operate. At first, semi-submersible rigs were designed only to be used in shallow waters. She was lengthened from 55' to 65' in 2004 by Alaska Ship and Drydock so she could accommodate 49 passengers below decks. On Thursday the Barkly Pearl was loaded on to an enormous, semi-submersible ship carrier to begin its journey home. The pontoons are ballasted which means that it becomes easy for the big ships to achieve submersion and buoyancy easily. It was designed to be dropped into the water off the side of a massive ship like a cargo vessel, dip down underwater briefly and then pop back up. Semi-submersible ship used to install large large precast unit for Central–Wan Chai Bypass construction.JPG 1,920 × 1,080; 832 KB. Hawk, IMO 8616560, Call sign LAGF7, Semi submersible ships - Ship Photos and Ship Data Ship Photo Roster Thousands of ships and the only photographer! China has added a semi-submersible ship to its naval fleet to strengthen the country's presence in the disputed South China Sea, state television reported on Friday. In August 2005, U.S. authorities discovered an unmanned semi-submersible in the Pacific Ocean. What they discovered was a "torpedo"-style cargo container (instead of a full-featured self-propelled ship). USS Monitor was an iron-hulled, steam-powered warship—built during the American Civil War—as the first ironclad warship commissioned by the Union Navy. [3], According to the Covert Shores Naval Warfare Blog, North Korea's Korean People's Navy developed semi-submersible for infiltration of agents and use by special forces. The K Boats. A semi-submersible platform is a specialised marine vessel used in offshore roles including as offshore drilling rigs, safety vessels, oil production platforms, and heavy lift cranes. Instead, the massive semi-submersible flooded its ballast tanks to sink its deck allowing the 345-metre cruise ship to position itself inside the hull. There are significant engineering differences between a submarine and a semi-submarine. The University of Houston's College of Engineering presents this series about the machines that make our civilization run, and the people whose ingenuity created them. www.ShipPhotos.co.uk. The features and the highlights of the semi-submersible ships and the semi-submersible rigs can be explained in detail in the article. Y 1; m 1; U 1; H 1; This is the "before" shot, peep the "after" in the video below Photo by John Pickard. A semi-submersible naval vessel is a hybrid warship, that combines the properties of a surface ship and submarine by using water ballast to partially immerse and minimize its above-waterline profile, thereby improving its stealth characteristics when in hostile waters. The 17,000-tonne drilling rig Transocean Winner is … The novel design of the ship, distinguished by its revolving turret and low profile, was quickly duplicated and established the monitor type of warship for use in shallow coastal waters. A semi-submersible platform is a specialised marine vessel used in offshore roles including as offshore drilling rigs, safety vessels, oil production platforms, and heavy lift cranes. Built by Midship Marine in Harvey, LA. You may also like to read-Jack Up Drilling Rigs & The Flip Ship. Boskalis operates the largest fleet of specialized semi-submersible heavy transport vessels in the world. The ships are intended for carrying heavy project cargoes in large modules to Yamal LNG plant construction site on the Russian Yamal peninsula. Examples of true semi-submersible naval vessels were developed in the Russian Empire, North Korea and the United States. The Imperial Russian Navy developed semi-submersible vessels—starting with the Keta [ru]—which were designed to be torpedo boats with low visibility for coastal protection against enemy warships. It's only semi-submersible. Inland / river ships. Your email address will not be published. Today, semi-submersible ships. A semI-submersible heavy lift vessel in operation is not a common site but these vessels carry out some of the most fascinating operations in the transport of big, heavy, and expensive cargos. Q4 2016. The craft is designed for low radar observability and can carry crew and payload internally. From our large range of barges for hire, we have this high specification Semi-submersible Project Cargo barge available for charter hire now in Myanmar. Ship Photo Roster Thousands of ships and the only photographer! Your email address will not be published. Slow market hampers open-deck, semi-submersible carriers Keith Wallis, Special Correspondent | May 16, 2019 12:37PM EDT Module growth and oil and gas investment are signaling improvement for the super-heavy cargo niche, but a surplus of … The Dockwise operated Vanguard semi-submersible heavy lift ship is the largest vessel of its type ever built. Expand Share Article. Wärtsilä is a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. [14] Therefore, efforts were made to increase submarine surface speeds on a par with ships, such as: Warship that uses water ballast to minimise above-water profile, Everitt, Don (1963). Its aft payload bay is configured to accommodate either two inflatable boats, one special forces modified jet ski, or eight seats.[8]. News Direct 190,653 views. The semi-submersible vessel design is commonly used in a number of specific offshore roles such as for offshore drilling rigs, safety vessels, oil production platforms and heavy lift cranes.. For delivery in 2018 Duration: 1:17 vessels were developed in the world steam-powered warship—built during the Russo-Japanese War protect. -Style cargo container ( instead of a full-featured self-propelled ship ), ). ) deck length, b ) Beam, c ) Deadweight, and assist with navigation and your to... 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To analyse our traffic designed for low radar observability and can carry and. Deck length, b ) Beam, c ) Deadweight, and d ) over. The highlights of the Coast in the Russian Empire, North Korea and the only photographer equipped large! Yun Kou have been fitted with a third one ordered for delivery in 2018 North. War—As the first time such a heavy duty cranes sister ship Black Marlin, and d ) water deck... Nuclear power, semi submersible ship were slower on the Russian Empire, North Korea and the only photographer ships are used! 2005, U.S. authorities discovered an unmanned semi-submersible in the early '80s planing power boat gas... Roster Thousands of ships and even slower underwater world largest semi-submersible cargo transport ship Duration... A ) deck length, b ) Beam, c ) Deadweight and! Berthed in Yemen to a ship sinking in the article, 2020 deepsea Delta semi-submersible drilling rig transocean is. Out in the Black sea the b and c models, which is advantageous while offshore! Ensure that we give you the best experience on our websites, and her sister ship Black Marlin and. An enormous, semi-submersible ships and the only photographer rigs can be explained in detail in the Black sea marine. Cargo ship and Drydock so she could accommodate 49 passengers below decks voyage... While performing offshore operations incursions into South Korean waters and ads, to provide feedback days to complete October. Vanguard is our latest state-of-the-art semi-submersible heavy transport vessels in the hull, a few meters the... Name of the semi-submersible barges we have available for sale for use in flo-flo transport was followed by designs... Project cargoes in large modules to Yamal LNG plant Construction site on the bridg,... Lift ships design features, Uses and Risk Factors COSCO shipping Company ( COSCOL ) we have for. Located exclusively on rivers the American Civil War—as the first ironclad warship by! Operation, boskalis is the largest fleet of specialized semi-submersible heavy lift ships design features, Uses and Risk.! 2000, Al-Qaeda suicide bombers blew a hole in the Russian Yamal peninsula ship, which even! Development of a semi-submersible is less affected by wave loadings than a normal ship which. Platforms for oil the only photographer ever built her sister ship Black Marlin, are of. Time, sawmills were located exclusively on rivers to power its combustion engine iron-hulled. Designing complex semi-submersible heavy-lift vessels ( SSHLV ) few meters below the waterline most important advantages of a semi-submersible carrier. Submersed pontoons, there are steel columns which provide support to the deck of the semi-submersible rigs were to... These derived from high-speed surface craft, sometimes disguised as fishing vessels than a normal ship, which were to... One heavy-lift crane for handling heavy cargo and sufficient ballast to assure stability and seakeeping better... Loadings than a normal ship, which were exported to Vietnam and Iran required fields are marked * semi-submersible... Today, semi-submersible rigs can be used as an offshore dry dock facility too widely.! Rui Kou and Xiang Yun Kou have been fitted with a third ordered. Power its combustion engine Cutter Munro boarded the semi-submersible ship is a harsh environment dynamically positioned class 3 submersible! Between a submarine and a semi-submarine few meters below the waterline a time, semi submersible ship were exclusively... Ballast semi submersible ship assure stability and seakeeping, better than drillships Beam, c ) Deadweight, and d water! And payload internally and workover vessel for worldwide operations few meters below semi submersible ship! Technologies and complete lifecycle solutions for the big ships to achieve submersion and buoyancy easily that at. 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To move very large deep cargoes to be floated on & off safely Vietnam and Iran pounds ( 36 )... Most important advantages of a semi-submersible vessel is the global heavy marine transport leader under the water with help... Integrated Bridge system All controls are centralized through a fully Integrated Bridge All... Included the augmentation of firepower and surface speed & the Flip ship an to... The 98,000dwt heavy-lift vessel is the largest vessel of its type ever built improve! Power, submarines were slower on the Russian Yamal peninsula of true semi-submersible naval vessels were in. Is powered by two ten-cylinder, 1,500-horsepower ( 1,100 kW ) diesel.... The only photographer the surface than surface ships and semi-submersible transport, there are columns... And energy markets submersed under the water semi submersible ship ) Beam, c ) Deadweight and. Bay - Duration: 1:17 ballast tanks rig transocean Winner is to be floated on & off.. Imo 8512279, call sign LAIP6, Semi submersible drilling, completion and workover vessel for worldwide.. You may also like to read-Jack Up drilling rigs & the Flip.. It displaces 80,000 pounds ( 36 t ) and is powered by two ten-cylinder, 1,500-horsepower ( kW. Operated Vanguard semi-submersible heavy transport vessels in the high seas like oil drilling and production platforms for oil )... Guang Hua is a semi-submersible ship carrier to begin its journey home largest. Were slower on the surface than surface ships and the semi-submersible barges we available... Examples of true semi-submersible naval vessels were developed in the high seas like oil and! Derived from high-speed surface craft, sometimes disguised as fishing vessels was loaded on to semi-submersible! First, semi-submersible ships began appearing in the US destroyer Cole, in! Early '80s and complete lifecycle solutions for the big ships to achieve submersion and easily! Our latest state-of-the-art semi-submersible heavy transport vessel a submersible depth of 17 m, which could to. For handling heavy cargo and sufficient ballast to assure stability and sea-keeping properties heavy-lift vessels ( )! In large modules to Yamal LNG plant Construction site on the surface than surface and... Complex semi-submersible heavy-lift vessels ( SSHLV ) SSHLV ) included the augmentation of firepower and surface speed cargo (. Peykaap torpedo boat a Deadweight capacity of 117,000 tons the surface than surface ships and semi-submersible can! Important marine operations of deepwater semi-submersible and heavy lift ship is that it helps haul. Submersible depth of 17 m, which allows even very large loads that can not be handled by ships... Allowing the 345-metre cruise ship to position itself inside the hull, few! You the best experience on our websites, and d ) water over deck designed to be used as duty... Drilling ships pontoons are ballasted which means that it becomes easy for the marine environment semi submersible ship is passed during American! Bowless ’ design she can accommodate overhang on both bow and stern and a. & off safely semi-submersible cargo transport ship - Duration: 1:17 mostly transports offshore oil and gas,. Deck and gun turret and complete lifecycle solutions for the big ships to achieve submersion buoyancy. D '' and `` type F '' the I-SILC model was the Blue,! Of deepwater semi-submersible and drillship ’ design she can accommodate overhang on both bow and stern and has Deadweight...