Snorkellers explore corals at Tween Island, 1983. Collection of the Great Barrier Reef Marine Park Authority

Copyright © Great Barrier Reef Marine Park Authority

Tourists diving from a pontoon on the Outer Barrier Reef, 1991. Collection of the Great Barrier Reef Marine Park Authority

Copyright © Great Barrier Reef Marine Park Authority

A snorkeller views the shallow corals at Heron Island, 1997. Collection of the Great Barrier Reef Marine Park Authority

Copyright © Great Barrier Reef Marine Park Authority

Tourists snorkelling off Low Isles, 1996. Collection of the Great Barrier Reef Marine Park Authority

Copyright © Great Barrier Reef Marine Park Authority

Tourists from the Coral Princess snorkelling at Nathan Reef, 2005. Collection of the Great Barrier Reef Marine Park Authority

Copyright © Great Barrier Reef Marine Park Authority

The cosmic scale, verdant islands, blue lagoons and brilliantly coloured underwater life of the Great Barrier Reef have attracted and intrigued visitors from the very earliest European navigators t

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