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This is a representation of a Boom defence using linked cables (hawsers) that stretched across Southampton Water between Calshot and Hook. The aim was to defend the port and shipping in Southampton Water from waterborne attacks. This development replaced some old ships/hulks that were anchored in a line. The original plans dated 1907 give clues as to how the boom operated which is described in the annotations.
Part one of the representation shows the six main structures, two anchorages, two piers and two dolphins. The latter however need to have their living accomodation, winches and guns added. This I hope to complete by this time next year ! The sound effects get louder as you move inside the structures.
A credit is due to Captain Sir Mansfield George Smith Cumming, KCMG, CB (1 April 1859 – 14 June 1923) for pioneering this develoment. Subsequently he became the first director of what would become the Secret Intelligence Service (SIS), also known as MI6.