Amusement park ride with unaccompanied boats floated on guideways through dark tunnels.
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Boat traffic halted for hours while floodgates were opened, lest the pounding of the river cave in its banks.
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Some of his many achievements include the first coast-to-coast traverse of Borneo and the discovery and exploration of the world's largest river cave.
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In 2012, Challen also set an Australasian record by diving to 221m in a river cave in New Zealand on an expedition with Harris.
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The only thing missing now is the crumbling terraces and river caves of Central Park.
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They went together toward the river caves.
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He wants to find the missing connection between the West Coast's Fox River caves and a nearby system ominously-named Armageddon.