To Dive Into or Immerse Something in Deep Water

This page is the CodyCross answer for the clue below from Top Secret, Group 2093, Puzzle 4 (Encryption Module).

Question is: To Dive Into or Immerse Something in Deep Water

and the answer is: PLUNGE

Word Meaning:

PLUNGE — (transitive) To thrust into liquid, or into any penetrable substance; to immerse.

Definitions from Wiktionary.