[Crannogman]

Even then, my reading of that Fluckey raid suggests it was more of an anchorage, and not ships tied up at piers etc. To a great extent the game is limited by flat seabeds that allow a sub to approach fully submerged almost to the shore everywhere. Sandbars, shoals, and other hazards are nonexistent. IRL, a lot of the "navigable" coastal waters are barely deep enough for a surfaced fleet boat - Midway is actually a prime example