Due to being in the North Atlantic, the captain asked twice to get a leather jacket and gloves, and he could feel the coldness of the sea, and he specially asked to use salt water to remove the ice from the portholes! as cold as war! Many big names have explained the film's tactics, history, and weapons by comparing the actual results (especially suitable for supplementing knowledge after watching it), but after all, it is a novel adaptation and has a fictional element. As a war film, it is very good, especially the rare hunting film. Intensive moments (three paragraphs), detailed special effects. Worth seeing!
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