I would like to give a suggestion to Stiebler :
In his shallow water ASDIC mod, the ability to detect a submarine depends on the sea depth. Would it be possible to replace the sea depth by the depth under the submarine's keel ? Thus, when a submarine is 100 meters deep with 10 meters under its keel, it is as if it was at 25 meters with also 10 meters under its keel.
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