[u-168]

No i dont think that is possible i have that sub mod i go to the bigger ports insted as i find the sub runs aground or grinds along the bottom of the smaller ports. Midway or pearl harbor has large ports but you can only use that mod on the us side you cannot attack tokyo as that has 2 close ports and a shallow sea bed. You are limited stright with that mod but i love the torpedos and the missiles.

U-168