 The Crater Cove huts were first constructed by squatters during the 1920s in the Middle Harbour bushland and remained inhabited until 1988.They were built on the low cliffs and wide rock platforms facing the harbour with water tanks carved into the rock, stone built chimneys, paths and edging.A group of Hawkesbury River huts (with boat access only) were occupied by one family group and included wells, terracing of the ridges, gardens, extensive dry stone walling and linking pathways.