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Sydney Harbour protection net

This plan of the Harbour Protection Net, dated 22 April 1942, shows the arrangement of dolphins (piles) along with the opening and navigation signals. The central section of the net was built between 30 December 1941 and 13 March 1942. The intricacies of the gates and the question of how the net connected to the shore meant that the Navy did not accept the Maritime Services Board's plans for these until late April. Thus the protection net was not complete when the Japanese midget submarine from I-27 was caught up in it on 31 May 1942. NRS 20011 [18/1716.2]
Sydney Harbour protection net
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