If you want to go scuba diving, you first need a certification in order to go scuba diving. Scuba diving resorts will never allow you to go diving without certification from any of the agencies mentioned. This is because scuba diving can be dangerous if you don t know anything about it. For instance, you need to know about underwater pressure and how to cope with it. The agency in turn will send a Certification Card or C-Card to the diver who just passed all the standard requirements imposed by the agency. Another kind of diving job is as a commercial diver. A commercial diver usually works in oil rigs, ships, and other industrial vessels that require underwater jobs, such as welding, cleaning a ships hull, or drilling. You may wonder why you need certification to become a scuba diver. This is because scuba diving resorts all over the world will never allow a person to go diving without certification. You may ask why. The reason for this is because they need to be sure that you know all the things involved in scuba diving and that you are capable of handling problematic situation in case it arises underwater. If thinking such creatures would really alarm you, then scuba diving is really not for you. Are you prone to getting illness? Or do you easily get sick? If yes, then do not go for scuba diving, try something else that does not require you to risk your health. Lastly, you should know how to swim. If deep waters really make you panic, then do not pursue scuba diving. How much more if you will spend your vacation underwater? You just can t imagine the enchanting beauty of the coral reefs and the aquatic creatures gliding in the sea. If you will just have the chance to take a glimpse of a real paradise, surely you will immediately grab it. One of the perfect activities today where you can spend your time with nature underwater is through scuba diving. Scuba tanks are often filled with air, similar to what we breathe on the surface, that are compressed to about 250 bar or 3000 pounds per square inch. Sometimes, scuba tanks are filled with special mixtures for special diving. You can also have a tank filled with NITROX that will enable a diver to have longer bottom time but shallower dives.