Two spectacular cases of submarines penetrating enemy anchorages are well known to naval-history enthusiasts. The first was when the Royal Navy’s E14, commanded by Lieutenant Commander Edward Boyle VC, surfaced in the Golden Horn, in the heart of Istanbul, in May 1915. This followed penetration of the heavily-mined Dardanelles, and was part of a successful campaign against Turkish shipping. The second instance was when Germany’s U-47, commanded by Kapitänleutnant Gunter Prien, found her way through the defences of the Royal Navy’s protected anchorage at Scapa Flow in 1939 and sank the battleship Royal Oak at anchor there.
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