Apnea diving is a kind of freediving. So, what is freediving? Freediving means that someone dives underwater without using any external breathing devices. Divers must be able to hold their breath until resurfacing.
The techniques acquired by divers range from simple breath-hold diving to competitive apnea dives. And the competitive apnea dives require divers to attain great depths, times, or distances on a single breath.
Keywords: apnea diving