Passengers on a flight from hell began bleeding from their noses and ears when a knucklehead pilot “forgot” to flick a switch regulating cabin pressure, a report said.

Jet Airways Flight 9W 697 from Mumbai to Jaipur made an about-face shortly after takeoff Thursday when the airplane lost pressure, the Hindustan Times newspaper reported.

Video from inside the eerily calm cabin shows the oxygen masks being deployed and passengers slowly putting them on.

“Panic situation,” wrote one person.

Added another: “Scores of passengers including me bleeding from nose… no staff to help… no announcement on board to wear the oxygen mask. Passenger safety completely ignored.”

Over 30 of the 166 passengers on board suffered bleeding and headaches and had to be treated when the flight landed back at Mumbai’s Chhatrapati Shivaji International Airport, according to a statement by the Directorate General of Civil Aviation.

Larit Gupta, a senior official with the department, told the Hindustan Times newspaper that the crew had forgotten to activate a switch to maintain cabin pressure.