Steve plus volunteers are creating a mould here, with which to make Turtle Reefs. So-called due to their turtle shell shape. The idea is to create a smooth, hollow "half-shell." Turtle Reef variations can then be created both inside, (for a smaller, denser unit, more suited to areas with stronger current), or outside (for a larger, more cave-like structure, better suited to calmer water with a flat bottom).
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