Every diver must know how to attach a bolt snap to the dive equipment and how to tie a bungee cord to the harness. These knots must be secure but easy to cut with a knife or scissors.
Why do we need to train ourselves to go on diving? Why are there so many specialties in diving? Why should we go back to training whenever we face underwater environments different from what we use to enjoy?
In order to really work as a team underwater, we need to have hand signs to communicate. The most important about the hand signs is that they must be simple, short and if it's possible that it can be executed with only one hand.
From the perspective of the diver certification agencies there is no difference between a sport diver or a recreational diver. But we can make a difference in styles based in how the diver perceives the diving activity. The same difference of styles we can find in other sports and hobbies.
The diving mask is a very important element our dive gear and often is not given the importance it deserves. Some water inside the mask does not present a hazard to the diver, but can make a good dive becomes a nuisance.
There are two types of materials used to manufacture fins: rubber and plastic. The main difference is that rubber is negative underwater and plastic have a buoyancy near to neutral underwater.
A bolt snap is a device that allows us to attach (clip off) some scuba gear to our diving harness. There are different materials which the bolt snap can be manufacture: stainless steel, brass or plastic. Of the three materials mentioned the most reliable is stainless steel.