9/10
The technical aspect
3 April 2017
Warning: Spoilers
I am watching this movie with a 96 year old Royal Navy veteran.

Now, when the sub clears the bridge, ready to dive, the officer puts his foot on a lever. The lever closed the voice tubes. Now, in every American movie, we never see this. I wonder if our subs USED voice tubes or microphones. Or we just never showed it.

The sub was a T type.

Also, the chlorine gas was from sea water getting into the batteries.

Now, the movie was quite realistic, with a few quirks. The sub is reported overdue..... and then we cut to the guys on the sub waking up. I don't think they were knocked out for two hours.

Acting is excellent, and the sets are good for the budget. A nice realistic touch is when the men got into the 'gun hatch'. Clearly showed how cramped it was, and opening the valves. Nicely done.

Nine stars!

PS, the RN man was on the Trenchant, a British sub in WWII. He had quite an adventure.
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