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The number might be three on each side of a small 10-metre (33 ft) boat up to 20 on each side for a 30-metre (98 ft) vessel with 1500 hp. [2] The great weight and strength of the gear can disturb the ground it is towed over, overturning rocks and dislodging and crushing organisms in its path.
The DIY Mermaid was designed as an entry for the sailboat-building competition, organised by Stanley Tools in 1961, and the first DIY Mermaid was built by the designer on the living room floor. The Do-it-yourself magazine [ 2 ] started serialising the construction drawings and instructions in June 1963, whereby the DIY Mermaid could be built ...
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 ...
A 1:1 scale construction drawing of a boat and its parts Lines plan A scaled-down version of a full-sized drawing often including the body, plan, profile, and section views Body Plan A view of the boat from both dead ahead and dead astern split in half Plan view A view looking down on the boat from above Profile view A view of the boat from the ...
US Navy diver dredging an excavation site during an underwater recovery operation, searching for personnel who went missing during WWII off the coast of Koror. Salvage diving is the diving work associated with the recovery of all or part of ships, their cargoes, aircraft, and other vehicles and structures which have sunk or fallen into water.
Cave diving guide line reel. A distance line, penetration line, cave line, wreck line or guide line is an item of diving equipment used by scuba divers as a means of returning to a safe starting point in conditions of low visibility, water currents or where pilotage is difficult.
Explosives detonating to sink the former HMNZS Wellington in 2005. Sinking ships for wreck diving sites is the practice of scuttling old ships to produce artificial reefs suitable for wreck diving, to benefit from commercial revenues from recreational diving of the shipwreck, or to produce a diver training site.
The diver must be able to safely reach a reliable alternative source of breathing gas at all times during the planned dive. Plans for technical contingencies may include arrangements for alternative equipment, spares, alternative boat etc. The level of contingency planning will depend on the project, and the importance of the task.