Bruce Bennett was only ever a competent B-lister, and here he performs pretty much to type in this routine wartime maritime drama. It's his job to lead patrols from Iceland to try to prevent submarine attacks on allied shipping heading to Britain from North America. The Nazis have clocked that this is happening, and so dispatch a team of agents to sabotage the facility and ensure that this useful flotilla is trapped in the harbour for the duration. It's really just a piece of feel-good propaganda with a solid enough story taking an hour to reach a predicable ending that flies the flags and…