Probly been answered times before…
Do submerged submarines can disrupt convoys?
Let’s say Japan has a Battleship, Cruiser and aircraft carrier in SZ5 and I just send a submarine there and submerge it, will it be able to disrupt convoy?
And let’s say the answer is yes, if I, as Japan decide to build a destroyer in the zone to counter that, what happen? It gives the option to the American to engage battle or retreat one case away as soon as the destroyer is build or the convoy happen and it’s at the American’s turn to decide what he do.