bail out

(intransitive, with of) To make a unscheduled voluntary termination of an underwater dive, usually implying the use of an alternative breathing gas supply.

Example:   Once again, the industry got itself in trouble and government had to bail it out.
2012, August 1. Owen Gibson in Guardian Unlimited, London 2012: rowers Glover and Stanning win Team GB's first gold medal
  Stanning, who was commissioned from Sandhurst in 2008 and has served in Aghanistan, is not the first solider to bail out the organisers at these Games but will be among the most celebrated.
2004, Chris Wallace, Character: Profiles in Presidential Courage
  Holmes bailed out of his fighter and parachuted onto an apartment house.
  I'm going to bail out of class today.
  I'm going to bail out of stocks and buy gold instead.