Danlisa had the Idea of having it applied to the torpedo select switch, the sequence would be:
1) flood tube before opening door. (to keep noise down)
2) open outer door.
3) fire torpedo.
The 3 buttons to play with are the select torpedo, open door, & fire torpedo, it would be neccesary to adjust mixer settings to make sounds & speech work well.
Of cource it may turn out not worth the effort but I still need some files to test with, I would like to give it a go.

UNLESS it has already been done.