The direction achieves agonies of suspense and thrills. The model work is somewhat weak, but the location shots atone for everything.

...because we care about the characters, we get caught up in the suspense.

Better than average understated WWII submarine drama from England.

A cracking wartime adventure about a submarine tasked with tracking down and destroying the new Nazi battleship "Brandenburg". The added authenticity of this being actually made during the war is hard to overstate; there is a palpable tension as Eric Portman and John Mills take centre stage in this - admittedly "flag waving" production. Featuring a daring raid on a fuel dump, a tense cat-and-mouse chase, and giving more than a nod to the concomitant problems faced by the families left behind ashore; this is a taut and convincing tale of underwater seamanship.