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Uncharted waters

Last Updated: September 30, 2025

Article by, Ian Tansley, Regional Director, Rathbones Until recently the bottom of the ocean presented the biggest challenge to travellers. But that is all changing. Welcome to the world of deep-sea tourism. Close to seven miles beneath the Pacific Ocean surface, at the southern end of the Mariana Trench, lies the deepest point on Earth. Known as Challenger Deep — after HMS Challenger, which first sounded the spot in 1875 — it is a mile deeper than Everest is high.