Definition of snorkels:
(n) :
(underwater diving) A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater.
(v) :
To use a snorkel.
(n) :
A retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth.
(n) :
A snorkel parka.