Up to 150 riders have paid a visit to hospital after crashing off their mountain bikes at the new $24 million Adventure Park on the Christchurch Port Hills.
At least five crashes left riders with life-threatening injuries.
Mitchell Podmore's life was saved by the helmet he was wearing which bore the brunt of his crash.
His injuries were so severe that he was helicoptered to Christchurch Hospital.
"I've got three fractures to my thoracic spine, I've got a punctured lung and I had seven stiches to the back of my head," he says.
Emergency services doctor, Dominic Fleischer says the injuries coming from the park are serious.
"Those injuries we are seeing are those you would typically see from a high-speed motor crash, broken ribs, punctured lungs, to tear through your spleen a high velocity injury. They're fairly full impact injuries," he says.
The bike park injuries are enough to put further stress on Christchurch's Emergency Department.
Mr Fleischer says doctors are worried patients will suffer with not enough resources available to meet the demand from the growing work load, which they say, is becoming unsustainable.
"Especially as we head in to winter our numbers will increase normally as well and so just putting a few more extra severe traumas on top of that will really put stress on the patients and potentially harm those patients and others in the department."
The number of injuries on mountain bikes has doubled in the last five years according to ACC - costing almost $15 million in 2016.
The adventure park says it has safety equipment in place and that tracks are not unsafe.
"Mountain biking is an adventure sport with a certain amount of risk, but it's absolutely safe. We've had tens of thousands of people through the doors, you just need to ride within your ability," says adventure park spokeswoman, Anne Newman.
Riders are warned to stay within their limits so they don't come off second best, especially on the park's more advanced downhill tracks.
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