No. You can use them separately, or you can use them together, but one is not necessary for the other to work. Open Hatch opens up the Type IX as well as the Type VII, but only the hatch between the control room and the forward section. FM's New Interiors features the whole sub except for the aft torpedo room, but only the Type VII.
__________________
“Never do anything you can't take back.”
—Rocky Russo
|