https://www.youtube.com/watch?feature=player_detailpage&v=QAtjTvqVmQI
That area is where Deep Creek spills out into the Mojave Desert. It's the start of the Mojave River. It's been used by offroaders for years but now some offroaders are driving through the tunnel and going around or over the barricade at the other end and driving further up the creek.