A drone clamps onto a ship's hull below the waterline and crawls it bow to stern hunting 15-pound magnetic charges built to fire if anybody pulls one off, a search that today still means a diver feeling along steel he cannot see  Autonocion.com Sat, 29th August 2026

The Steel Bayonet (1957)  Blu-ray.com Sat, 15th September 2018

Michael Caine Proved He's the King of the War Movie Genre With These Releases  warhistoryonline Mon, 21st August 2023

The Steel Bayonet (1957)  IMDb Sat, 7th November 2020

John Paul Movies & TV Shows List  Rotten Tomatoes Fri, 27th August 2021

Bernard Horsfall obituary  The Guardian Wed, 30th January 2013