It was first surveyed in 1951 by its namesake ship using echo sounding.
It was first surveyed in 1951 by its namesake ship using echo sounding. The manned vehicle that reached its greatest depth did so in 1960 and it was the Bathyscaphe Trieste which observed that the floor consisted of diatomaceous (`) ooze. The surrounding area is named for a nearby island group. The depth record for unmanned probes was broken here in 1995 by the Japanese probe, Kaiko. With a maximum surveyed depth of 10,923 meters and located in the Mariana Trench FTP, identify this deepest known point in the oceans.
It was first surveyed in 1951 by its namesake ship using echo sounding.
{Challenger Deep} (prompt on “Mariana Trench” before mentioned)