Stickleback-class_submarine
Stickleback-class submarine
Military vessel
The Stickleback-class submarines were midget submarines of the British Royal Navy initially ordered as improved versions of the older XE-class submarines. They were designed to allow British defences to practice defending against midget submarines since it was theorised that the Soviet Union had or could develop such craft.[1]
The Royal Navy developed plans to use these craft to carry a 15-kiloton nuclear naval mine (based on the Red Beard weapon) codenamed Cudgel into Soviet harbours.[1] The project was unsuccessful as there were problems finding and paying for the necessary fissile material.[2]