The Importance of Scuba Dive Buddy Check
Diving with a partner (or buddy) means that there is someone to help if you encounter problems underwater. For the system to work properly, however, you and your buddy need to conduct your own briefing before a dive and check that all equipment is functioning properly.
from: http://ezinearticles.com/?The-Importance-of-Scuba-Dive-Buddy-Check&id=6274160
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