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Line 83: ===Knock John Fort (U4)=== [[File:Knock John (U4) Fort.webp\|left\|thumb\|170x170px\|Knock ~~Jon~~John Fort]] Knock John fort is situated approximately {{convert\|16.1\|km\|nmi\|0}} from the coast off [[Essex]] and was grounded on 1 August 1942. It was decommissioned on 14 June 1945 and evacuated on 25 June 1945. The platform was maintained until May 1956 when it was abandoned.<ref>{{cite web\|url=http://www.offshoreradiomuseum.co.uk/page459.html\|title=Knock John Fort\|website=www.offshoreradiomuseum.co.uk}}</ref> In 2009, it was observed that there was a slight distortion of the legs when viewing the tower from west to east. It is thought that [[Hydrodynamic scour\|underscouring]] is the cause of this.<ref>{{cite web\|url=http://www.bobleroi.co.uk/ScrapBook/CityReunion/FortFanatics.html#knockjohn\|title=Fort Fanatics\|website=www.bobleroi.co.uk}}</ref>

Maunsell Forts: Difference between revisions