I think I've read about it, must have been Silent Victory or Thunder Below. The Japanese would lower a hook into the water to "catch" the sub. What I didn't know was that they attached a flag and a buoy.
This idea is genius because if you manage to attach the flag to the sub you can never lose it. If you rely on sonar or ASDIC alone you can. After a depth charge went off it can take up to 10 minutes until you are able to use sonar etc. effectively again.
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