depth bomb

Overhead, anti-submarine patrol planes dropped depth bombs and an acrobatic flight team sketched circles in the sky.

One of the depth bombs had sought it out in its invisible lair, battered in its sides, wrenched open its seams and sent its pirate crew to their last account.

British destroyers were instrumental in saving many lives and also immediately gave chase to the submarine which, it is believed, was sunk by depth bombs.

Practice with depth bombs and smoke screens helped to relieve the tedium of the long trip.

Other bombs known as "depth bombs" are fitted with flanges that revolve as they sink, causing an explosion at any desired depth.