A Quantas flight from Los Angeles to Melbourne was forced to turn around an hour into its long-haul journey after a leak turned the aircraft aisles into "rivers".
Travelers were settling down for the 14-hour journey when water began leaking from the upper deck and filling the economy aisles after a pipe had burst in the business class cabin.
News of the leaking flight reached Twitter when passengers landed at LAX airport.
Susanna Halliday, tweeted pictures of her soaked seat and blankets which were used to mop up water on the plane’s staircase.
Hollywood actress Yvette Nicole Brown, who was also on board the aircraft, tweeted about the mid-air crisis.
The star told CNN: "It looked like a trickle at first and I thought someone had spilt a soda or pop or something and it just got bigger and bigger and it filled up both aisles.
"It literally was like a river running down the aisles of the plane. It was the scariest thing I have ever seen."
A spokeswoman for the airline said the captain decided to return the A380 to Los Angeles due to passenger discomfort, rather than any fears about safety.
"It was an inconvenience for passengers. Crew did everything they could by moving passengers to unaffected areas and giving them extra blankets," she added.
Passengers were offered hotel accommodation in LA while checks were made to resolve the issue on the plane but for one passenger it was "one of the worst hotels" she'd ever stayed in.
The airline said in a statement: "We apologise to customers for the inconvenience. We are liaising with Airbus to understand what caused this fault."