# HMRG Deep

> English word · Proper noun

## Definitions
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.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hmrg-deep