Barney and Gemma show that coral reefs are like our cities - and everyone has a job to do.
From boxing shrimps to chomping sharks, it's hit or be hit with these creepy critters.
Barney and Gemma find out what happens in the Barrier Reef in the hours of darkness.
Barney Harwood and Gemma Hunt meet extreme recyclers in the Barrier Reef.
Meet the snottiest, slimiest and most gut wrenching gang of the Barrier Reef.
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