“Challenger Deep” (in the Mariana Trench near Guam), is the deepest location in our world’s oceans. At a depth of roughly 35,800 ft (6.78 miles), it remained one of the great mysteries of oceanography ...

ANCHORAGE, Alaska — Retired Navy Capt. Don Walsh, an explorer who in 1960 was part of a two-man crew that made the first voyage to the deepest part of the ocean — to the “snuff-colored ooze” at the ...

Just as Earth’s land surface has enormous peaks and valleys, the oceanic world has similarly varied topography. Perhaps the most intriguing of these features is the Mariana Trench — a chasm in the ...