Your flight leader has a sixth sense about where in the Marianas enemy U-Boats have surfaced. If you follow his lead and stay close, he will lead you to Das Boot.
When you find a U-boat, they will only stay surfaced long enough to haul in their dirty laundry before diving away. Eventually even the slowest U-boat crew will rig the ship to dive. If the U-boat dives away before you can sink it, the flight leader is really good at finding another one.
The mission includes all the current WWII era aircraft. You can also fly this mission in any aircraft if add them in the mission file. The WWII asset pack is strongly recommended, but not required ( see customizing below ).