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..im watching the 'very good so far' film Below made in 2002.
in the film the Destroyers are using drag chains with vicious anchor-like grappling hooks on them to drag for subs. I have never heard of this before - its an awesome idea if its real and it looks terrific in the film.
is this a real technique for catching out subs in shallow water?

its a psychological-horror thriller set in 1943 in the Atlantic. its starts off on an American sub. the sets are great and a terrifying depth charging to start with. id recommend this film - though its not over yet.