[Illustration: _Figure 42. View of interior of recompression chamber. If divers must be brought up in a hurry they are rushed into this chamber for decompression to prevent their getting the “bends.”_]
=b. Diving and salvage training.= The diving and salvage training is given officers and enlisted men with particular emphasis on operations performed in and around docks, quays, and other waterfront structures, harbors, inland waterways. Diving and salvage operations are essential to the rehabilitation of ports. The training should include the following:
(1) Diving-team problems with timber and steel construction; underwater concrete construction; underwater demolition of docks, piers, and ships; and actual salvage operations.
(2) Individual diving problems including underwater reconnaissance, pipefitting, patching, welding, cutting with hydrogen torch and oxyelectric machine; survey of underwater conditions in mud, swift currents, and various tide actions; use of jetting nozzle and siphon.
(3) Use of hand tools, air tools, machine tools, pumps, winches, and blacksmithing.
(5) Elementary instruction and training in—
(_g_) Air compressors, air flasks, field expedients.
_1. Hand pump._ _2. Rubber sneakers._ _3. Air hose._ _4. Diver’s underwear._ _5. Expansion tank._ _6. Face mask._ _7. Weighted belt._
[Illustration: _Figure 44. Diver in No. 2 diving outfit set._]
=c. Diesel engineer training.= This is advanced training for those men having previous Diesel experience. The operation, maintenance, and repair of Diesel engines are studied.
=d. Seaman training.= The apprentice seaman is given a basic course in seamanship. It includes instruction in—
(1) _Nautical terms._ All nautical terms and what they mean, including the parts of a ship and construction terms.
(2) _Ground tackle and its use._ The various kinds of anchors and how they are used; rules for anchoring.
(3) _Lifeboat seamanship._ Lifeboats and their handling, surf seamanship, the sea anchor, use of oil, helmsmanship.
(4) _Safety at sea._ Avoiding accidents, keeping equipment shipshape, safeguarding against fire, fire-fighting and life-saving equipment, first aid.
(5) _Marlinespike seamanship._ The common knots, how to make fast to a cleat, whipping, splicing, the care of rope, handling and use of lines.