This is an out of gas drill with the RB80 configured without stages.  Photographs are courtesy of underwater photographer Sonya Tittle.  I'm the donor in this drill.

RB diver off the loop signaling out of gas

Donor closes loop and deploys long hose

Out of gas diver now on donor's long hose.  Donor on back up.

Donor goes back onto RB loop

Donor going through flow check

Situation secured

Out of gas diver has RB loop secured under chin, donated long hose is around back of head and over RB loop.

Divers ready to head for exit