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voor de liefhebbers van WWII duikbootliefhebbers :)

The Fleet Type Submarine  (1946)

PREPARE TO ENTER THE WORLD OF THE SUBMARINERS
NavPers 16160, The Fleet Type Submarine, the 1946 U.S. Navy training manual, lists the general procedure for diving as given below. The Ship's Organization Book of each submarine carries the diving procedure for that particular sub. You are now ready to submerge yourself in this webpage on a typical WWII Fleet Type sub.

Diving Procedure. The diving signal is two short blasts on the diving alarm, the second blast being the signal to start the dive. Two blasts are used to guard against diving on an accidental single blast. An alternate diving signal is the word "Dive, Dive" passed orally.

When the diving alarm is given, the following procedure is observed (items marked with an asterisk are executed at once without further orders):

*a. Stop all engines, shift to battery, set annunciators on "All ahead standard," open engine room doors and air locks.
*b. Close outboard and inboard engine exhaust valves, close hull ventilation supply and exhaust valves, close inboard engine air induction flappers, and close conning tower hatch.
*c. Open bow buoyancy vents and all main ballast tank vents, except the group or tank designated to be kept closed until pressure in the ship indicates that all hull openings have been closed.
*d. Rig out bow planes and place on FULL DIVE. Use stern planes to control the angle of the ship.
*e. Diving officer checks hull opening indicator light panel for condition of hull openings. Air is bled into the ship when green lights show all hull openings closed. Watertight integrity is assured when the internal air pressure remains constant.
f. The following operations are performed by direction of the diving officer, who isw guided by the existing conditions:
1. At 45 feet, shut the vents and slow to 2/3 speed.
2. At 15 feet short of desired depth, blow negative tank, shut its flood valve, and vent the tank.
3. Level off at specified depth, slow to 1/3 speed, cycle the vents, and adjust fore-and-aft trim and over-all weight.
4. Diving officer reports to conning officer when trim is satisfactory.

When diving in a heavy sea, the maneuver is accomplished most expeditiously by diving with the sea abaft the beam.

Thanks to Rockhound57 :)