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 keeps spirits up. I doubt very much whether most of the adequate cast and/or the crew even knew where Iceland was, much less filmed there - but given it was made slap bang in the middle of the conflagration there are enough pyrotechnics and fist fights to keep it moving and it just about does what it says on the tin.