[underwater exhalation]
Your bottom time ends when you start to make a direct ascent to the surface.
It's important that you're able to control your ascent because dive tables are based on an ascent rate of no faster than 30 feet per minute.
There are a few things you need to adjust in order to moderate your ascent.
For example, the air inside your BC starts to expand.
Also gas trapped in your exposure protection will expand and increase your ascent rate.
You need to stay with your dive buddies and everyone in the group should ascend at the same rate.
Before you make a controlled ascent there are a few things you need to do.
Check with your dive buddies and make sure they are ready to leave bottom.
check your cylinder pressure and then check your dive time so you know when your dive ends.
Hand positions are very important during a controlled ascent.
All divers should always have their right hand with a closed fist above their head.
The closed fist protects your fingers.
The fist above your head protects your head from overhead obstructions.
All divers always look above themselves and their dive buddies for overhead obstructions
and we can only ascend as fast as the slowest diver in the buddy team.
When the divers get to the surface, the first thing they do is inflate their BCs so that they're positively buoyant.