A diver starts to adjust his bouyancy for fin pivoting.

Practising "tired diver tow".

Preparing for a controlled buoyant lift.

Divers practising "tired diver tow"

Divers signal "OK" to each other.

A simulated swim to the surface using a buddy's alternative air supply (AAS /  "Octopus").

Terry demonstrates mask removal and replacement procedure.

Practising breathing from a buddy's alternative air supply (AAS, or "octopus").

AAS practice.

A diver practises "fin pivoting", getting his buoyancy just right so he rises and sinks with his breating.

Practising mask removal.

Mask removal and replacement exercise.

Practising breathing without a mask in place.

Practising removal and replacement of the demand valve (second stage).