For full immersion:
1) Stock up with a boatload of food in your bedroom and do not exit the room... even when you need to use the bathroom (carry a bucket or tub for your waste).
2) Don't bathe often.
3) Get some friends to come over and join in (make sure they're ready to hang around for weeks and weeks without ever leaving the room).
4) Find some good books to read and maybe stock up with some magazines or music records.
5) Wear a u-boat commander's uniform (this includes buying any medals your guy might have earned so far in the game).
6) Close your door up and stuff rags under the opening to keep fresh air from flowing in; close the windows up tightly, too. This will simulate the stuffy and claustrophobic environment of a u-boat. Also, only open your windows when your boat is surfaced in the game (don't open the door, though).
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