Unit Used to Measure How Deep Water Is
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2172, Puzzle 1 (Oxygen Detector).
Question
Unit Used to Measure How Deep Water Is
Answer
FATHOM
Word Meaning:
FATHOM — (chiefly nautical, historical, US) A man's armspan, generally reckoned to be six feet (about 1.8 metres). Later used to measure the depth of water, but now generally replaced by the metre outside American usage.
Definitions from Wiktionary.