BOOM DEFENCE. 1940, THAMES ESTUARY BOOM DEFENCE, DEFENDING THE PORT OF LONDON, THE NAVAL HARBOURS OF CHATHAM AND SHEERNESS. - So that our own shipping can pass through the boom defence there are two 'gates', gaps in the boom which can be opened and closed at will, operated and guarded by heavily armed 'Gate' ships. Here are anti-boat defences of the Thames Estuary Boom Defence. ,

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