Details of the wingsuit crash which killed three people - including New Zealander Dan Vicary - have been revealed.
French wingsuit flyer Vincent Descols, who had flown the same area the day before the crash and was meant to be part of the fatal flight, has analysed a video of the accident in the Lutschental Valley in Switzerland this week.
It claimed the lives of Vicary, 33, Frenchman Ludo Woerth and American Brian Drake.
Descols said, in a post shared on the World Wingsuit League's Facebook page, https://www.facebook.com/WorldWingsuitLeague that his friends were flying in a long flat valley and had two opportunities to pull their parachutes during the one minute 20 second flight.
The first lasted 40 seconds early on in the flight and the second lasted just three seconds, 14 seconds before the trio impacted the ground, Descols said.
In that final 14 seconds they were too low to deploy their parachutes, he said.
Their flight path was meant to take a steep downhill line but they missed it and ended up circling around a ridge and finding only flat terrain in front of them, Descols said.
They made a left turn to try and reach a steep downhill section of terrain but impacted with the ground before they could reach it.
Vicary and Drake crashed 10 metres short of that drop off, while Woerth ended up just three metres short of it, Descols said.
No-one was to blame for the crash and they were all "outstanding flyers", he said.
Descols went on to offer lessons that could be taken from the crash and said it was a tragic mistake.
"They were great humans, and as humans we make mistakes, all of us."
- Fairfax Media