HMRG Deep

English

Etymology

From the Hawaiʻi Mapping Research Group, which performed a sonar survey of the region in 1997, and discovered the deep.

Proper noun

HMRG Deep

1. Former name of Sirena Deep.: A deep in Mariana Trench, Pacific; second deepest place in the Mariana Trench, and third deepest place on Earth.

Coordinate terms

• Challenger Deep
• Horizon Deep