In 1943, during World War II, HM Fort Roughs (sometimes called Roughs Tower) was constructed by the United Kingdom as one of the Maunsell Forts, primarily to defend the vital shipping lanes in nearby estuaries against German mine-laying aircraft. It consisted of a floating pontoon base with a superstructure of two hollow towers joined by a deck upon which other structures could be added. The fort was towed to a position above the Rough Sands sandbar, where its base was deliberately flooded to sink it on its final resting place. This is approximately 7 nautical miles (13 km) from the coast of Suffolk, outside the then 3 nmi (6 km) claim of the United Kingdom and, therefore, in international waters. The facility was occupied by 150–300 Royal Navy personnel throughout World War II; the last full-time personnel left in 1956. The Maunsell Forts were decommissioned in the 1950s. More information...
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