Question about Type VII ballast tanks

[Onkel Neal]

So, we are deciding to model three discrete sets of ballast tanks:
MBT #2
MBT #4
Negative tanks

Sure, we could include all the tanks, including trim and torpedo compensating tanks but we only have 4 players (not a real human crew of 48), so it makes sense to design the game so that 3 or 4 guys can manage it without this activity becoming a burden that takes away from the gameplay. You know, finding a smart balance so that the players have some procedural activity without turning this into real work.

Here's the current crash dive game procedure:

1. Order: "Alarm!" Alarm bell activated by Chief.
2. Chief switches from diesel to electric motors, then orders ahead flank.
3. Captain closes voice tube on the bridge, descends into conning tower.
4. Exec takes a depth sounding, reports depth under keel.
5. Exec marks on chart where boat’s location is at the start of the dive.
6. Captain closes conning tower hatch, says “Conning tower hatch is closed"
7. Chief silences alarm bell.
8. Chief sets dive planes to forward hard down.
9. Captain orders “Flood”
10. Chief opens the MBT #4 vent valves allowing seawater in the main ballast tanks.
11. Exec opens the MBT #2 vent valves allowing seawater in the main ballast tanks.
12. Chief opens the Negative vent valve allowing seawater in the negative tank.
13. Captain sets depth with order “Go to depth, xx meters.” (At the front usually to 80 meters)
14. Once the down angle indicator indicates the boat has a down angle, hold: 8 to 15°
15. Chief closes vent valve for negative tank and blows tank to control dive before desired depth is reached. After execution of the order "Flood" and the boat has a noticeable descending tendency, the negative buoyancy tanks are expressed (blown by compressed air), by the Chief, who will call out, “Express”. It is critical that the Chief perform the crash dive operation competently, otherwise the boat could dive out of control, below safe depth, or with a dangerous down angle.
16. The ordered depth is achieved by the Chief’s operation of the dive planes.
17. After the report of Chief: "Boat is at xx meters", the order always follows, Captain: "Close vents".
18. Chief and Exec closes MBT vents valve.
19. Exec checks bilge level and reports any leaks or problems, “No leaks detected, Herr Kaleun”.
20. Chief checks compressed air level and reports, “Compressed air at xx millibar, Herr Kaleun”.
21. Captain orders new speed, course as necessary.
22. Chief reports battery status, “Both batteries at xxxx amps, Herr Kaleun”.
23. Sonar reports any contacts.