FILM: Below. using drag chains..?

[flag4]

..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.

[raymond6751]

First used in WW1 but also used by Japan in WW2, I believe. Shallow waters only.

[bertieck476]

Thanks for the info will have a look.
Its available here http://www.youtube.com/watch?v=zXxUGbdRWMw

[Kapt Z]

First used in WW1 but also used by Japan in WW2, I believe. Shallow waters only.

Yes, I remember reading about a US submariner recounting that tactic used against his sub by the Japanese. Don't know if it was ever used against a u-boat.

[Red October1984]

It was in War in the Boats: My WW2 Submarine Battles

The Japanese used it and actually hooked the USS Crevalle. :up: