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.

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

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

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

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

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