The Buoyant exhaling ascent is taught to trainees to ensure that, if a malfunction of the Escape suit occured and their head and mouth became immersed in water, they would still be able to arrive safely on the surface, the escapee must continue to blow out the expanding air inside his lungs during the ascent.

Ladder drill - The correct blowing rate is vitally important and must be perfected before a Buoyant Exhaling ascent can be conducted.

Trainees are then given a full brief prior to entering the lock.

The trainee will be told to take a good deep breath, he will then be pulled into the main body of the tank, when he is blowing out correctly and has been checked he will then be released.

During the ascent the trainee must continue to blow out all the way to the surface and never ever stop trying to blow out.

Safely on the surface the trainee will then be assisted out of the water.

All trainees will then remain standing on a white line for a period of medical observation.

The Hooded ascent will enable the escapee to breath normally all the way to the surface.

On completion of a full brief, the trainee will climb into the tower, and be met by a second instructor.

Whilst in the tower the escapee will remain plugged into an air supply, this will provide the buoyancy required to reach the surface and also the air to breath during his ascent. During pressurisation the escapee must also continue to clear his ears, keeping ahead of the increasing pressure.

As the trainee exits the tower he will be checked before being released.

During the ascent the trainee will continue to breath normally all the way to the surface.

Safely on the surface the trainee will then be assisted out of the water.

All trainees will then remain standing on a white line for a period of medical observation.