What should a diver do when making an emergency ascent?

During an emergency ascent, it is crucial for divers to exhale continuously throughout the ascent. This practice helps to prevent a dangerous condition known as decompression sickness or "the bends," which can occur if a diver ascends too quickly while holding breath.

As a diver ascends, the pressure around them decreases, and if they hold their breath, the expanding air in their lungs can cause lung over-expansion injuries. By exhaling continuously, divers allow the expanding air to escape safely, reducing the risk of injury. This technique is essential for maintaining the integrity of the lungs while ascending, especially in emergency situations where speed may be a priority.

This approach underscores the importance of proper ascent techniques in underwater safety protocols and diver training. It is a fundamental rule that all certified divers should be familiar with to promote safe diving practices.