A massive pile-up involving almost half the Supercars field has caused millions of dollars worth of damage and suspended racing at Symmons Plains.

Will Davison was injured and a further 11 cars suffered major damage in a crash Rick Kelly described as the worst he’d been involved in over 16 years in the sport.

Wet weather caused the concertina-like crash on just lap two of a scheduled 120-kilometre race at the Tasmanian circuit.

A dozen drivers – including Garth Tander, James Courtney, Scott Pye and Rick Kelly – were caught up in the mayhem on lap two.

After a 45-minute delay, the race was restarted and Shane van Gisbergen was astonishingly awarded a race win despite just two laps under the safety car.

The result is the Kiwi’s third win from three races in a perfect start to the season.

Davison, badly winded, was taken to hospital suffering lower back pain after the crash, described as a 9G-force impact.

Spray from the wet Tasmanian track impeded drivers as they headed down the straight in front of the crowd at over 200 kilometres an hour.

The conditions made it difficult to discover the origins of the crash, but contact on Tander appeared to set off a chain reaction.

The Wilson Security Racing driver span out, possibly after a shunt from Cam Waters, and brought most of the field into the wall with him.

“I’ve got no idea (what happened) … I’m not blaming anyone at this stage,” Tander said.

“Someone hit me in the rear and I went sideways. Sideways there is not good because the whole field is coming at you.”

Of the impacted 12 cars, 10 are Commodores and two are Altimas.

Team owners and drivers were distraught from the garage.

“There are five million dollars of motorcars sitting there,” ex-driver Mark Skaife said on the Fox Sports broadcast.

“This is like a wrecking yard. Staggering damage.”

The cars of Tim Slade, Nick Percat, Tim Blanchard, James Moffat, Alex Rullo, Will Davison and Taz Douglas also sustained major damage.

It appears that the majority of the impacted dozen won’t be able to compete in the rest of the Symmons Plains meet.

Simona De Silvestro was also involved but managed to wriggle free to pit lane and finish 15th.

There was no podium presentation but van Gisbergen claimed the points ahead of Jamie Whincup and Craig Lowndes.

Pole sitter Scott McLaughlin was jumped off the line and decided to pit with the safety car, finishing 13th.