article_snippet: Passengers said Pilot and first officer were unable to breathe without the masks as halon - a liquefied, compressed gas - filled the confined space as Plane flew from London Stansted Airport to Valencia.
article_snippet: Hannah White said: ‘One of the fire extinguishers in the cockpit went off and the cockpit’s got halon gas, which is very dangerous, and as a result Pilot and first officer couldn’t breathe.'
article_snippet: Hannah White added: ‘their masks deployed [for the flight crew] and we dropped down to a very low altitude.
article_snippet: When [the pilot] came over the tannoy to talk to we you could hear the flight crew breathing through their masks.
article_snippet: One of the flight attendants became anxious and oxygen masks did not deploy for passengers in the cabin, Hannah White added.
highlights_snippet: Pilot heard breathing through oxygen mask while making announcement .
  