Season3followsthefortunesofayoungU-boatcrewastheyengageintheBattleoftheAtlantic,arehunteddownbyanobsessedRoyalNavyCommander(RayStevenson)andaresentonadangerousmissiontotheSouthernHemisphere.TogethertheyformstrongpersonalalliancesunderthecommandofRobertEhrenberg(FranzDinda).