This is what I found in the Wiki manual.
The selected tubes door will close whenever you select a new tube with the ‘Y’ key. The newly selected tube will stay open.
The selected tubes door will close whenever you press the 'W' key.
The selected tubes door will close whenever you fire a torpedo.
The selected tubes door will close whenever you select a different tube from an attack scope.
The selected tubes door will not close when you select a different tube from the TDC (F6) screen.
Tube doors do not have any time limit for staying open.
http://www.communitymanuals.com/shii...itle=Torpedoes
I think that if you open door 1, and then click door 2 and open it, it will close door 1.
Hopefully this helps.
