A diving snorkel is
a tube about a third of a meter (one foot) long, usually J-shaped, fitted
with a reasonably comfortable mouthpiece, and constructed of rubber or
plastic, used for remaining submerged while diving in shallow waters.
Some snorkels have float-operated valves attached to the end away from
the user's mouth to keep water out when the swimmer submerges. Most, however,
are allowed to flood, and the water expelled by a sharp exhalation through
the snorkel when the swimmer returns to the surface.
A snorkel (also spelled "schnorkel"
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