An curved arrow pointing right. The To-Sua Ocean Trench is a swimming hole in a volcano's crater. People from all over the world travel to the Samoan island of Upolu to swim in the crystal clear ...
to the deepest place in the ocean - the Pacific Ocean's Mariana Trench. He spent four hours exploring the bottom of the trench in his submersible, built to withstand the immense pressure of the deep.
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