What happens when a plane loses cabin pressure? What actions should be taken?

Supplemental Oxygen Depressurisation of the aircraft cabin as a result of structural failure, pressurization system. Signs of sudden decompression include “a loud bang, thump or clap” as the air inside and outside the plane meet, debris flying around the cabin .Is loss of cabin pressure dangerous? Yes.. In 2005, as referenced above, a Helios Airways plane en route from Cyprus to Athens crashed into a mountain after a loss of cabin pressure, killing all 115 passengers and six crew on board. The official investigation into the incident found that the pressurisation system had been left…