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The Mariana Trench is an underwater trench at the bottom of the Pacific Ocean, off the coast of the Mariana Islands. It is the lowest point on the Earth's crust, sitting 35,814 feet below sea level at its deepest point. The Tomas Branch hid a Clue, Quartz at the bottom of the trench, protected by sea lions. The Janus Branch is aware of the hiding spot, but has so far been unable to obtain the Clue.