German WWI U-boat found after 100 years missing at sea

[Donkees]

8. Sea Mines Warfare 1914 – 1918

"The North Sea was the main location to lay sea mines. The location and the number of mines laid depended on the anticipated target in view. Some of the main aims for all warring parties were to defend their coasts, coastal travel, ports and naval bases. The Germans laid mines in distant waters to sink merchant and naval vessels serving Britain. The Allies often specifically targeted the German U-boats in the Strait of Dover, the Hebrides, and, most important, the Northern Barrage (see below).

Main minefields in the North Sea were the British East Coast including the Strait of Dover, Helgoland Bight and the Northern Barrage. A rough figure for each of these areas is 50,000 mines. The total number of mines in the North Sea was 190,000 and the total number during the whole of WWI was 235,000 sea mines."


http://www.climate-ocean.com/book%202005/05_14-Dateien/05_14.html