A snorkel longer than 1 meter (about 3 feet) will make it impossible to breathe as the water pressure on the chest will make it impossible for him to expand his chest and fill his lungs. A diver below this depth will need to breathe pressurised air from a tank.
Becasue if a SCUBA diver didn't go underwater, they really wouldn't be a SCUBA diver. SCUBA stands for Self-Contained Underwater Breathing Apparatus.
I heard that they recorded a scuba diver breathing underwater
A SCUBA (self-contained underwater breathing apparatus) tank
Snorkel
a breathing tank! try it its fun! (underwater swimming)
One can easily purchase a Snorkel Vest by checking local swim shops or order one online through: Amazon, Ebay, LeisurePro, Diver's Supply, and DiveRightInScuba.
diver
Not necessarily. It just depends on what someone means. Scuba diving is only when you use a scuba tank or cylinder that a diver carries. Deep commercial divers will often get their breathing gas supplied to them through a long umbilical hose ... so they are attached and do not carry Self Contained equipment that they can swim with like a SCUBA (self contained underwater breathing apparatus) diver.
a divice that supplies air to underwater swimmers
You call him a diver.
A scuba diver.
From a regulator attached to a scuba tank.