A Scottish skydiver plunged one kilometre after both her parachutes failed - and survived with just a broken ankle.

Zoe Sievwright, 29, who was taking part in a solo jump in Perthshire, central Scotland, on Saturday in memory of a brain tumour victim, said she was in a "complete panic" when she realised she was falling to her death, Scotland's Daily Record reported.

Remarkable survival ... Zoe Sievwright.

"You go into an arch and I started counting - 1000, 2000, 3000, 4000 - and then I checked my canopy," Ms Sievwright said as she described what went through her head after she jumped out of a plane and headed towards the drop zone at Strathallan airfield in Perthshire.

"We were told that if it was big and rectangular that was fine, but the canopy was all tangled.