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you can scuba dive swim at beachs
There are many PADI dive shops along the Queensland coast where the Great Barrier Reef is located. Any of those shops offer scuba dive gear rentals and tours.
It would cost 15$ in Australian money
groper
Scuba Diving, exploring the reef itself, fishing.
In 1942, Hans Hass, outfits a research vessel, The Sea Devil, for scuba expeditions and becomes the first person to dive In the Red Sea and on Australia's Great Barrier Reef using SCUBA.
Well, you's be in the sea off Australia
Steve Irwin, he died when he was stung in the heart by a stingray while scuba diving in the great barrier reef in 2006.
The government actually lives in the great Barrier Reef. Amazing Right they place scuba gear on all the octopi and eat nacho cheese with the fish. This is killing all of our unicorns in the world and making kids in china sad
Open Water
The Barrier Reef is a protected area, so I suggest getting local information and advice. I doubt if any boating activity is allowed, except possibly, scuba diving (with restrictions as to not removing or damaging the coral).
The Great Barrier Reef is used mostly tourism these days and what they like to do while there is snorkeling, diving, sight seeing on the reef or they just like to do something more relaxing like have lunch on the pontoon or just have a nice swim.