Here's a mid-air nightmare that you never would ever want to experience; a US carrier Southwest Airlines has grounded about 80 of its planes for inspections after a hole opened up in the roof of one of its aircraft while it was 11,000 meters in the air!

The events occurred last Friday, when a Boeing 737 lost cabin pressure after the hole developed, prompting frightened passengers to grope for oxygen masks as the plane made a terrifying but controlled descent before making an emergency landing at a military.

No serious injuries were reported among the 118 people aboard although a flight attendant was slightly hurt, according to Southwest officials. The cause of the hole was not immediately known, although the FBI called it a "mechanical failure," not an act of terror or other foul play.

You can read a personal account of the harrowing ordeal via passenger Shawna Malvini Redden's blog here.