A dive to the deepest point of the world's ocean - a podcast by RNZ

New Zealand deep sea explorer Rob McCallum is about to undertake a journey to the deepest point of the world's ocean. He and Australian colleague Tim Macdonald will be descending in a submersible the Eastern pool of the Challenger Deep - located in the Mariana Trench about 340 kilometeres southwest of Guam, attempting to produce depth records for both countries.

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