For some reason i.e. a patronizing view that US cinema audiences would never watch a film unless it had an American star in it, several British film studios in the 50's and 60's billed American actors in the leading role of what were essentially British War Movies. These include such as 'Bridge on the River Kwai' -William Holden ', 'Sailor of the King' -Jeff Hunter '633 Squadron' – Cliff Robertson, 'Cockle shell heroes'- Jose Ferrer, The Great Escape' -McQueen, Bronson, Coburn etc. all top Billed. Most Played Canadians. Submarine X-1 does the same.It is essentially a navalised version of '633 Squadron'. The parallel is startling. A Canadian Officer leads a diverse group of heroes on a suicide mission, to Norway in both cases, to destroy a strategic target. This entails hazardous and relentless training in Northern Scotland with the new weapons, against a increasingly tighter deadline and unsympathetic top brass.The Germans do their best to stop the mission by sending respectively air raids and a commando raid to the bases concerned. The missions go ahead nevertheless with the unit adjutant getting to go on the mission at the last moment when a trained member drops out. After many tense (?)setbacks the mission is competed but only with the destruction of majority of the attacking force.Both films suffered from very poor special effects but at least 633 had footage of real Mosquito's possibly its only redeeming feature. Submarine X-1 does not have this. There is no humour or even a romantic interlude and very little tension. As stated elsewhere what tension there is, was contrived i.e. the mutinous attitude of some of the men which not developed and in the minefield sequence. It is ironic that production values were good enough to provide a realistic sub interior and authentic German Paratrooper uniforms and weaponry. Stock footage was of the correct type of aircraft, even if they would have never been able to reach their supposed targets. So I think the potential was there to make a half decent film but no one bothered.The commando raid scene was confused and filmed too dark The final mission with frogmen hopping in and out of subs like they were buses was incoherent.The Previous film depicting this true mission ' Above us the waves' with John Mills is far better.

This movie is another one not to bother with. I prefer my historical movies as accurate as possible as reality is usually more dramatic and entertaining than hokeyness. There was an X-craft squadron, they did train rigorously for a raid against the Tirpitz (the movie calls it the Lindendorff-why fictionalize it?), they almost succeeded, the did penetrate the Tirpitz's defenses, damaged it badly enough that it could never sail at full speed again. Why not pay tribute to these brave men who fought for our freedom by telling their story straight? And the special effects are cheesy-the ships look like the models I built as a kid in the 1960s.

Yes, I agree with the average 4/10 rating. This is another marginally watchable, below average mid-60s fare, worth your time only if you have absolutely nothing else to do with your time. Not horrible, but nothing remarkable either. Little in the way of character development, no memorable dialogue, and a plodding, straightforward plot (if you can call it that). If you make it all the way through, follow the crew's example, and break out the brandy; after that, you deserve one.

A fictional story based on actual events. Intriguing as an american is portrayed in the armed service of the UK. Another such situation was in the movie 633 Squadron with Cliff Robertson. Overall a good movie.