Underwater Diving

the diver uses a self-contained underwater breathing equipment to breathe underwater.Scuba divers carry their own source of breathing gas, usually compressed air.
40 m -- the limit for recreational diving
30 m to more than 50 m-- Professional diving
However, there are programs that train divers for dives to 120 metres

might feel disappointed that the underwater world actually looks a little bit less colorful than in the TV documentaries. The color that is absorbed the quickest is red.
Oxygen becomes toxic under high pressure. That is why special gases with lower concentration of oxygen are provided for dives deeper than 42m.
In 2016 Cem Karabay, from Turkey, settled a new world record for the longest dive, with a total of 192 hours, 42 minutes and 42 second spent underwater.

Yolanda Reef,
Egyptian Red Sea