This photo from the late 1940s or early 1950s is one of only a few contemporary photos we have showing the GPMTCP. The two upper arrows point to the capped air intakes, the center arrow points to the approximate location of the connection that is still exposed. Battery Benson is on the left, Battery Ash on the right behind the intake. Three of the four anti-aircraft gun mounts are visible, the guns would have been brought out and clamped to the wooden brackets when they were needed. The mounts were installed in 1918. Note the lack of trees between the gun batteries and the water.

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