This condensed trail is hidden in between apartment complexes and neighborhoods. You will find packed dirt lines with rooty obstacles and the occasional limestone rocky feature. There is a hidden jump line skills park you can hit for fun as well as parallel drop lines. Ranger drop is also a Hermes trail, but not part of the Underground.
Start Point
Follow the trail sign to the blue loop and begin at the forked trail where it splits between red and blue loop.
End Point
End on the straightaway before crossing the washed out bridge that leads to the metal siding piece, the main creek will be on your right.
Directions from Parking to Trail
Take the concrete path counter clockwise around the park and you will find the trailhead sign.