flickr photo credits: (1) Serenae (2) bionicteaching (3) Serenae (4) Serenae (5) bionicteaching
Five Card Story: .jhlkjn.jkhkuh
a Five Card Flickr story by m,jh,mnb,h.kjn.k created Nov 23 2011, 02:33:23 pm. Create a new one!
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Unlike early diving, which relied either on breath-hold or on air pumped from the surface, scuba divers carry their own source of breathing gas (usually compressed air),[3] allowing them greater freedom of movement than with an air line. Both surface supplied and scuba diving allow divers to stay underwater significantly longer than with breath-holding techniques as used in snorkelling and free-diving. Depending on the purpose of the dive, a diver usually moves underwater by swimfins attached to the feet, but external propulsion can come from an underwater vehicle, or a sled pulled from the surface.
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