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Admiralty air supply air-lock air-pipe Alexander Lambert armoured ascent atmospheric ballast bell boat body bottom breathing apparatus bulkheads buoyancy cable Captain carried cofferdam compartment compressed air compressors crew cylinders Davis deck decompression Decompression Chamber deep depth designed diver diving apparatus diving-bell diving-dress dress engine escape explosion fathoms feet long fish fitted Fleuss floating flooded gold hand hatch hauled helmet hole hull inside J. B. S. Haldane joints later life-line lifting lower Mary Rose metal method minutes observation chamber oxygen patches pipe plate pontoons port position pressure pumps raised recovered rope round Royal Navy salvage operations salvors Scapa Flow screws sea-bed sections self-contained self-contained breathing apparatus ship ship's side Siebe sink square inch starboard steel stern submarine submerged sunk surface tank tide tons torpedo towed treasure tube underwater valve vessel watertight weather weight wire wire rope wreck