Scuba diving activities, such as Truk lagoon diving, is the practice of exploring deep areas underwater with the use of specialised equipment. Most countries need licensing for this activity, but most people can dive if there’s a licensed diver present. It’s a fun activity for people who want to explore oceans and lakes.
Scuba stands for self-contained underwater breathing apparatus. Divers will carry compressed air, usually composed of a breathing gas. This leaves them free to explore the water without needing to come back for air repeatedly. Others prefer a method called free diving. They hold their breath underwater for long periods of time.
There are two types of breathing apparatus you can use on a dive. These are:
Open-Circuit – This is the most basic variety. You inhale gas from the device and exhale it into the environment. This allows for one-
time respiration for every breath of air.
Rebreather – This is also called the closed or semi-closed circuits. It’s less used in common dives because the equipment tends to be more expensive. However, the technology is more complicated as well. It’s equipped with a vent that absorbs all the air you exhale. A mechanism removes carbon dioxide from it. This allows you to use one breath of air multiple times. You can carry a smaller tank of oxygen, as well.
There are several types of breathing gas you can use for a dive. The most common is a mix of oxygen, nitrogen and trace gases in the ratios 21:78:1 respectively. Others prefer enriched air nitrox (EAN), which is more oxygen-rich (32%-36%). This helps prevent decompression sickness for divers.
Divers also wear suits to protect their skin from the environment. They work to make the diver more buoyant. It also makes it easier for the person to swim around underwater. Some even prefer to use weights to help them stay submerged.
Goggles are a must for every diver. These give them vision underwater. Eyewear for dives is specially designed, as water has a different refractive index. This means you’ll have a harder time seeing whilst submerged.