(military) Alternative form of antisubmarine
Mk. 17 depth bomb is being unloaded from a SOC Seagull scout plane on board the USS Philadelphia (CL-41) during an Atlantic U-boat sweep near Panama in June 1942.
(military) Alternative form of antisubmarine
Hedgehog, a 24-"barreled" anti-submarine mortar, mounted on the forecastle of the destroyer HMS Westcott, 28 November 1945. The 27-year veteran Westcott claimed the first-ever kill by Hedgehog February 2, 1942, when she sank U-581.