You can also have a tank filled with NITROX that will enable a diver to have longer bottom time but shallower dives. NITROX mixes alters the air mixture by increasing the oxygen content and decreasing the nitrogen content. This is done by measuring the scuba tank content with NITROX analyzer. This is typically safer for most divers because this lessens the risk of nitrogen being trapped inside the body and cause bends. For instance, you need to know about underwater pressure and how to cope with it. The pressure itself can be dangerous if you don t know how to equalize. It can lead to discomfort in the ear and sometimes may relatively cause injuries in your ear drum. You should also know about the air you breathe if it is under pressure. The water current can give you the opportunity to dive within 15 feet from reefs up to diving 200 feet on sea mounds without getting swept by. The largest of Bay Islands is Roatan which is about 42 miles long and 2 miles wide. Roatan s northern and southern reefs is home of about 40 dive sites that can give both beginners and professional divers the chance to explore the plummeting walls, caverns, and crevices. Learn to Dive by Taking Proper Scuba Diving Instruction Scuba diving is one the most popular recreational activity in the world. It can also be one of the most rewarding careers if you want to turn professional in scuba diving. However, people prefer scuba diving as a recreational activity. The underwater world provides unique wild life that can really excite people. How much is your budget for the scuba diving vacation? Does the resort provide for emergency equipment if unavoidable accidents occur? Are you going to spend the vacation alone or with a group? By trying to ponder on said questions, more or less you will gauge your capacity if you are really ready for scuba diving in Hawaii. There are not only two but several gears that you need to make yourself ready before you can take a secure splash underworld. Scuba diving is a form of recreation that most of the people enjoy. Trips and vacations are also some of the desirable activities that divers wish to participate. For the diving enthusiasts, anything that concerns about scuba diving is interesting.