[TEC] Crew Below and Diesel cut-off depth - hard-coded or tweakable?

[Sailor Steve]

Shutting down the diesels is the very first thing that happens when the dive order is given.

When the diving alarm is given, the following procedure is observed (items marked with all 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 on 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.

http://www.maritime.org/fleetsub/chap18.htm#18A