Some people find they have a natural tendency to hold tlieir breath when they first begin learning to use scuba, but this tendencyus he changed. The lungs can be injured hy even Although lung overexpansion injuries are very serious and among the most difficult Bali scuba diving injuries to treat, they are also among the easiest to avoid: Simply breathe at all times and do not hold your breath when usin scuba. 

During your confined water Bali scuba dives you'll practice some skills during which you take the scuba regulator out of your mouth, but even then you don't hold your breath. Instead, you'll learn to exhale a slow, steady stream of bubbles any time the regu-lator isn't in your mouth.Your other air spaces generally pose no prob-lems during ascent. Normally, expanding air releases from these without any conscious effort. 

It is possible, though, to feel pain and discomfort in your ear and sinuses while ascending due to a reverse block, sometimes called a "reverse squeeze." A reverse block occurs when expanding air cannot escape from an air space during ascent. In this case, you feel discomfort because the pressure inside the air space exceeds the surrounding water pressure.

Reverse blocks are uncommon and generally result from Bali scuba diving with congestion cleared by medication, and having the medication wear off while underwater. To avoid this, don't Bali scuba dive with a cold or allergy congestion, even if you use decongestants or other medication.