A video has emerged of a man giving the camera a wave before diving off a moving train in Perth over the weekend.
In it, the unnamed train surfer can be seen crouched on the last carriage of the train as it travels over the Fremantle Railway Bridge in Western Australia.
Authorities have confirmed that the incident happened on Saturday morning.
As he waves to the camera, he stands up and jumps off into the water below, just about missing a concrete pillar.
But Public Transport Authority spokeswoman Claire Krol told Perth Now that it wasn't just the concrete thad could have proved fatal.
"Aside from the fact that he's managed to survive the fall... he was standing just beneath 25,000 volt overheard wires," she said.
"Those wires can actually arc so you don't need to reach out to touch one of those wires or even rub against one for it to electrocute someone."
The PTA is now investigating the incident, with CCTV footage indicating that the man climbed onto the train at North Fremantle station at about 10.30am on Saturday.
If caught, he could be facing 12 months imprisonment and a $12,000 fine for trespassing.