This is not a bother because scuba diving is almost everywhere. Aside from making a difference, people go for scuba diving vacation due to various reasons. First, some of them want to fulfill their skills in photography by trying to capture the majestic species in the aquatic environment. Second, they simply like to experience the nerve-breaking feeling in the underwater. It is a cargo ship that sunk years ago and is located about a mile of the island of Uvita. There are also available dive centers in Costa Rica where you hire dive guides and these dive centers also offers scuba diving instructions. If you want to dive, but you need certification, Costa Rica is one of the best places to learn scuba diving. A dive master s job is to ensure the safety of the entire divers he or she will guide in a particular dive site. He or she will be the one taking the responsibility to guide and ensure the safety of recreational divers. Before you become a dive master, you should first be certified as open water, advanced open water, and as a rescue diver. This is because tempered glass is less likely to shatter into fine, hazardous slivers. Another feature you should look for is that it should have a comfortable skirt with a close fit to your face and provides a good seal. A mask should also have an adjustable strap that can be locked in place. You should always remember that scuba diving is a relaxing and fun activity, choosing the wrong scuba mask will make it uncomfortable and annoying. A simple way top put it is the deeper the dive is the lesser the oxygen and nitrogen and the more there will be helium in the mixture. Helium is used because it is less narcotic than nitrogen and you can dive deeper without worrying about oxygen toxicity. This is because you lessen the oxygen and nitrogen content in the mix and are replaced by helium. For example, if you are certified as an open water diver, you are only allowed to dive in dive sites that have a minimum requirement of open water diver. However, if you are certified as an advanced open water diver, you can dive at dive sites that have a minimum certification level of open water and advanced open water.