The Leigh Light (L/L) was a British World War II era anti-submarine device used in the Battle of the Atlantic. It was a powerful carbon arc searchlight of 24 inches (610 mm) diameter fitted to a number of the British Royal Air Force's Coastal Command patrol bombers to help them spot surfaced German U-boats at night.
Photograph of a destroyed U-boat illuminated in Leigh Lights
The Observation Post at Putsborough overlooking Morte Bay
The Indicator arrow at Putsborough overlooking Morte Bay
U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. The term is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, though the German term refers to any submarine. Austro-Hungarian Navy submarines were also known as U-boats.
The first German submarine, the SM U-1.
The German submarine U-14, showing the kerosene vapour trail.
Sea mines are loaded in a UC coastal submarine in the harbour of Zeebrugge