What happens when you give a 20-year-old pro racer the keys to a 190hp UTV? That's exactly what the Martelli Brothers and Mad Media (aka the people who produced and directed the first three Gymkhana videos) wanted to find out. They decide to take a brand new 2014 Polaris RZR to Walker Evans racing, who juiced it up with insane mods, and then hand it off to the completely buck wild RJ Anderson. The venue? An abandoned California mine shaft in the desert. 
We were there for the show, and we're itching to tell you, but we can't ... yet. So, for now, check out the teaser video below and click through for some preview images. Look for the full story soon. 

[via UTVUnderground]