Patrol the seas on a re-created conning tower, complete with both an attack and an aerial-navigation periscope. Using these periscopes, outfitted with high-resolution LCD displays, race against the clock to launch a torpedo and determine your vessel's bearings to decide whether it is safe to surface.
On the attack periscope, become "Captain" and attempt to identify and lock in on an enemy target. A "Watch Officer" mans the aerial-navigation periscope, seeking out critical visual and navigational information. The patrol is a success if you can identify the harbor or dive before aircraft or enemy destroyers detect your vessel!