Sharks are also abundant in Costa Rica. If you want to see sharks, Costa Rica is the place to go. Various species of sharks are seen in this area, including bull sharks. This diving is only reserved for experienced divers with higher certification levels. Costa Rica is also known for its great underwater visibility. Before you become a dive master, you should first be certified as open water, advanced open water, and as a rescue diver. A certification agency will also specify a minimum number of dives in order to be qualified to be included in the course. The dive master can also certify those who want to learn scuba diving. Wonders of Thailand Scuba Diving If you are one of the innumerable men adoring the pleasure of scuba diving then maybe planning a perfect scuba diving in Thailand is a great idea. Scuba diving lets your experience the wonders of underwater world. Marine or aquatic resource is a composition of the superb flora and fauna ever created in the kingdom. Mostly, professional divers use standard air that is composed of 21% Oxygen and 79% Nitrogen for the open circuit sets. Open circuit sets is cheaper than any other kinds while in close circuit types you re equipped with rebreathers. In rebreathers, your exhaled air is reprocessed to make it fit again for re-inhalation. This mixture of gases inside the scuba tank enables you to dive deeper and is commonly used by technical divers and on salvage operations. This is the most expensive mixture available. TRIMIX is a mixture of oxygen, nitrogen and helium. The mixture ratio also varies depending on how deep the dive is. 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.