The thrilling and true story of the development and operational deployment of human torpedoes - 'Chariots' - and 'X-craft' midget submarines in British naval service during WWII, and of the extraordinary men who crewed these dangerous vessels. The commando frogmen who rode the Chariots and operated as divers from the X-craft were the forerunners of today's Special Boat Service, the SBS. Their aim was to attach an explosive charge underneath an enemy ship to destroy the vesse