Answer:
During this survey, the deepest part of the trench was recorded when the Challenger II measured a depth of 5,960 fathoms (10.90 km; 35,760 ft) at 11°19'N 142°15'E, known as the Challenger Deep.
Step-by-step explanation:
Mariana Trench - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Mariana_Trench