The Ring of Fire is home to the deepest ocean trench, called the Mariana Trench. Located east of Guam, the 7-mile-deep Mariana Trench formed when one tectonic place was pushed under another.

The mission was nothing less than to build a submarine that could take James to the deepest-known point in the Earth’s seabed – the Mariana Trench, with a depth of almost 11,000m ... Australia is ...

This story appears in the June 2013 issue of National Geographic magazine ... in a deep seafloor trench off the coast, a shakedown run for the big dive to come in the Mariana Trench.