Submersion is the act of being completely held under water (or liquid) for a long time. Scuba divers use breathing tanks to maintain submersion during long, deep dives.

Words with -merse or -merge come from a Latin verb meaning to dip, soak or plunge. How risky is that plunge? It’s a matter of degree, and you can find that highest degree of risk in the prefix, sub, under. Submersion is often death-defying. The legendary entertainer Harry Houdini thrilled his audiences by undergoing submersion in a 100-gallon milk can! (Don’t try that at home.)

Definitions of submersion

n the act of wetting something by submerging it

dousing, ducking, immersion
Type of:
the act of making something wet

n sinking until covered completely with water

immersion, submergence, submerging
a brief immersion
Type of:
a descent as through liquid (especially through water)

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