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. It also encourages a lot of tourists to enjoy a thrilling and fun experience under the water. There are many tourist destinations like the scuba resorts that are well known to people. Thailand is offering the best scuba diving resorts that have special instructors for people having great passion for scuba diving. Scuba diving underwater trips is exciting and you can select from different possible trips underwater - Decide what you wanted to explore or view underwater. It may include coral formations, shipwrecks, rare fish, spectacular color or large animals then choose your destination. You need to have diving expertise if you wanted to dive in freezing cold water or diving deeper on a reef with lower visibility - Purchase a diving insurance or a travel insurance to ensure that you are protected if ever you encountered accidents during your scuba diving trips. There is indeed a great destruction of the environment at present. You cannot just imagine the dead fishes that are found along the shore. Things are getting worse because of human deeds. Aquatic resources should be nourished. It does not only add beauty to the surroundings but it is a source of living for people living in the rural areas. Scuba mask is your window to the underwater world. Vision underwater is possible by using a scuba mask because it creates an air space between your eyes and the water. However, you might mistake a scuba mask to goggles that you would commonly see being used by Olympic swimmers. Although goggles also let you see underwater, it does not entirely mean that you can use it for 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 pressure itself can be dangerous if you don t know how to equalize.