What happens if you stop breathing while diving?
If you hold your breath and the pressure surrounding you decreases, (i.e., you ascend) the air in your lungs will expand. When the air cannot escape in a natural way, the pressure in the lungs increases and a DCI results. Overexpansion of the lung can lead to serious injuries.
Why scuba divers are not afraid of sharks?
To a shark, from below, they can be mistaken for a seal or other animal. Divers spend most of their time under water, where the shark can clearly see that they pose no threat and are not their food source.
What is the most common injury in scuba diving?
The most common injury in divers is ear barotrauma (Box 3-03). On descent, failure to equalize pressure changes within the middle ear space creates a pressure gradient across the eardrum.