Passengers on a Qantas flight from Sydney to Auckland have described their shock after they were forced into an emergency landing when their pilot made a mayday call over the Tasman.

The life-threatening distress signal was triggered from QF141 on Friday when a cockpit alert warned of a fire in the cargo hold .

WATCH THE VIDEO ABOVE: Qantas flight’s mayday emergency after false fire alert.

Travellers on the Boeing737 said concern swept through the cabin, which included Wallabies fans travelling for Saturday’s Bledisloe Cup test at Eden Park.

“It was a bit of turbulence on the flight, like flight attendants rushing up and down the aisle,” one passenger said.

“They called a meeting halfway over, serving us food.

“But we were just like, what is happening? Like, what is happening?”

See Full Page