First expedition to explore Tonga Trench
Tuesday, June 4, 2019 - 20:29
An extreme explorer expedition in Tonga is aiming to become the first to dive and explore the Horizon Deep within the Tonga Trench. This week the Five Deeps Expedition aims to find out if the Tonga Trench is only the second-deepest in the Pacific or if it might be actually deeper than the Mariana Trench.
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