How much evidence is there regarding the naval punishment of keelhauling? Keelhauling is a famous naval punishment under which the offender would by dragged beneath the hull of the ship This would have been encrusted with shellfish such as barnacles which would - at the very least - have caused some nasty lacerations
How was a line looped under a sailing vessel for keelhauling? The Wikipedia article on keelhauling says: The sailor was tied to a line that looped beneath the vessel, thrown overboard on one side of the ship, and dragged under the ship's keel, either from one side of the ship to the other, or the length of the ship (from bow to stern)