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Blind cave fish

Huge fluctuations in oxygen and CO2 levels 1,000m into the cave had similar effects on the crew to working at altitude. Protective masks and oxygen monitors were vital. A high-definition camera, fitted with a periscope lens waterproof to a depth of about 2m, was used for the real close-ups. Strong water current made it hard for both crew and tripods to stay upright.

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