At the TDC screen you can open the doors one after the other (keys w and q opens and closes the selected tube) and they stay open until you close them again or shoot an eel. In this case only the selected or empty tube will be closed.
If you change to periscope view, switching the selected tube will close all the other tubes but the new selected one. Firing a tube does not close the other tubes. You can select the next tube and all tubes keep their status.
Prepare your setup accordingly and you can shoot your torpedos without delay and at the periscope stations.
If you open the tubes in 3D - they behave like they have been opened at the TDC screen.
In short: changing the selected tube in periscope view closes all doors but the new selected one. If this new tube was closed - all tubes are closed now.
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