I was mistaken. I think I'm remembering an old version of SH4. I just noodled with my OM, and I can open all four forward tubes at once...
Which version of SH4 Uboats do you have (Steam, Amazon, DVD)? What folder on the computer do you have it installed in? How are you opening the tubes?
You should be able to cycle through the forward tubes with the 'W' key, and open / close them with the 'Q' key. When you switch from say Tube 1 to Tube 2, or vice versa, the other should remain open, unless you dive below 99 feet (32 meters), approximately.
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