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It was timber and plastic mesh, only about 6ft high
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The fence was put there to stop boating families pulling up on the beach on the eastern side of the Botany Bay extension and having a picnic on the grass next to the runway.
The plan was erect the usual ICAO approved chain wire fence with three strands of barb wire to control access. However, the engineers overruled that idea due to the long metal fence could have some effect on the ILS for RW16 (there was no L or R in those days).
The eastern sea wall was never completed on the extension because there was a possibility that a close space parallel runway would be built there.
That all change when the wide space parallel R/W was built and the whole area was surrounded by the concrete seawall.
So ends today's history lesson.