American submarines risk everything to surface in enemy waters and rescue downed aviators.

A German U-Boat Commander makes an unprecedented voyage to attack Allied shipping off the coast of Australia on Christmas morning.

An American submarine commander risks everything in a fight from within an enemy convoy.

A German U-boat commander launches a shocking attack at the heart of the Royal Navy.

After a violent collision, an American submarine crew begins a desperate bid for survival.

The life of German U-Boat commander Fritz Julius Lemp, who accidentally sinks the passenger liner SS Athenia, takes a series of dramatic turns when he is later forced to the surface after attacking an Allied convoy.