VIDEO: Helmetcam Shows Unconscious Skydiver's Descent
The team helped him land safely in the frightful mishap.
Jan. 29, 2014 — -- A skydiving adventure in Wiltshire, England, turned frightful after one of the jumpers lost consciousness as he hurtled toward the ground, helpless to open his parachute.
In the July 2013 video that ABC News obtained, the group of skydivers climbed onto the outside of a plane, ready to jump.
James Lee, 25, of Gloucestershire, England -- an experienced skydiver with more than 1,000 leaps under his hat -- wore a camera on his helmet.
WATCH: Miraculous Rescue of a Skydiver in Freefall
Seconds after he jumped, though, one of his fellow skydiver's legs hit him in the back of the head, knocking him out instantly.
"A jumper that left the aircraft afterwards came down a little bit unstable and knocked me unconscious on the back of my head," Lee told ABC News. "From then, I have no real recollection of what happened on the skydive."
With the camera wobbling, an unconscious Lee tumbled toward Earth from 12,500 feet. Typically skydivers fall at an average speed of 120 mph.
Eventually Lee's friends noticed there's something wrong with him.
"Two of my friends that saw what happened came down tried to see if I was responding to basic hand signals and there was no response," Lee said.
When Lee didn't respond to his friends' hand signals, they approached him and moved his body to the correct position. They then deployed his chute.
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As Lee drifted toward Earth, he regained consciousness but with no memory of the incident.
He vowed, however, that the accident would not stop him from skydiving again.
"I was just happy to be on the ground because everything goes a bit slower there," Lee said.
It's not the first skydiving mishap to make the news recently. Makenzie Wethington, 16, is recovering after falling 3,500 feet -- more than half a mile -- in a skydiving accident Saturday in Oklahoma.