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2. Dry deck shelter - Wikipedia

   en.wikipedia.org/wiki/Dry_Deck_Shelter

   A dry deck shelter (DDS) is a removable module that can be attached to a submarine to allow divers easy exit and entrance while the boat is submerged. The host submarine must be specially modified to accommodate the DDS, with the appropriate mating hatch configuration, electrical connections, and piping for ventilation, [ 1 ] divers' air, and ...

3. Portable boat lift - Wikipedia

   en.wikipedia.org/wiki/Portable_boat_lift

   A portable boat lift is not a boat lift which is commonly found attached to a dock. Although some devices allow one person to separate a boat from a trailer or lift a boat up and out of the water, they are not by definition portable. The term "boat lift" originally referred to lift locks. In modern usage the term "boat lift," as opposed to ...

4. Inflatable boat - Wikipedia

   en.wikipedia.org/wiki/Inflatable_boat

   Inflatable boats with transoms have an inflatable keel that creates a slight V-bottom along the line of the hull to improve the hull's seakeeping and directional stability. These vessels are very light, so if powered with an engine, it is best to put weight in the bow area to keep the bow from rising while the boat is going up on plane.

5. Abraham Lincoln's patent - Wikipedia

   en.wikipedia.org/wiki/Abraham_Lincoln's_patent

   Abraham Lincoln's patent relates to an invention to buoy and lift boats over shoals and obstructions in a river. Abraham Lincoln conceived the invention when on two occasions the boat on which he traveled got hung up on obstructions. Lincoln's device was composed of large bellows attached to the sides of a boat that were expandable due to air ...

6. List of boat lifts - Wikipedia

   en.wikipedia.org/wiki/List_of_boat_lifts

   Geheyan dam boat lift, also in Hubei Province, capable of lifting vessels of 300 tons displacement. The dam was completed in 1994, but technical difficulties delayed the opening of the ship lift for four more years. Longtan dam boat lift, capacity to lift vessels of 250 tons, in a basin 40×10.8×1.8 meters, and a vertical lift of 68.5 meters. [2]

7. Lifeboat (shipboard) - Wikipedia

   en.wikipedia.org/wiki/Lifeboat_(shipboard)

   Inflatable lifeboats may be equipped with auto-inflation (carbon dioxide or nitrogen) canisters or mechanical pumps. A quick release and pressure release mechanism is fitted on ships so that the canister or pump automatically inflates the lifeboat, and the lifeboat breaks free of the sinking vessel.