I thought the grapples were rather nasty. Does anyone know if that tactic was really used??
I've been reading Capt William Ruhe's book
War in the Boats - My WW2 Submarine Battles and he recounts an incident on his fleet sub Crevalle when they were trapped on the bottom in 174 feet and Japanese ASW ships dragged grapnels for them. He describes the clanking of a grapnel going over the boat's hull and then having a grapnel hook onto his sub and start dragging it into deeper water.
Since the sub was trimmed with neutral bouyancy it was "light" enough to be dragged around by the Japanese ship. They eventually broke free of the grapnel and escaped. Apparently the Japanese had an explosive device that could be attached to the grapnel cable and dropped down onto the sub, where it would explode on contact. Scary stuff!
smith