MAUNSELL SEA FORTS OF THE THAMES ESTUARY DVD

Describes the building and placement of the Naval and Army Sea Forts in Thames Estuary. Contains very rare wartime film footage of the grounding of Roughs Tower, when a disaster was narrowly avoided, and the sinking of Knock John Naval Sea Fort in designed manner. The sinking of the first Naval Sea Fort (Roughs), almost ended in disaster, due to a panic order given before the pre-sinking procedures had been completed. All the drama of this sinking is captured on film and viewers will look in disbelief as the huge 4,500 ton structure lists over 35 degrees and almost capsises with over 120 men on board.