Like many old films this film suffers when it comes special effects, even if some live sequences of u-boats sinking ships is cleverly used, the overall impression of the special effects is a little pathetic, but not extremely so.
The acting is more than OK, the story following Nicolas Monsarrat's book, with the same name, quite well, too.
A very young Denholm Elliot impressed me a lot, as did Jack Hawkins as Ericson, the captain of the ship and Donald Sinden, who was new to me, as the First Officer.
So, while not a masterpiece, it had aged well!
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