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An "antenna" mine developed in July 1917 was effective at the assumed maximum submarine depth of 200 ft (61 m); and 100,000 of these new Mk 6 mines would be adequate to form the North Sea mine barrage.The objective was to prevent U-boats from operating in the North Atlantic and preying on trans-Atlantic shipping. A similar barrage had already been placed across the English Channel, which had resulted in U-boats diverting north around Scotland. The North Sea Mine Barrage was intended to close this alternative route, and it also made it hard for the U-boats to get supplies.
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