The tunnel came in two parts. A small bit of it was just wading into thick plants, and only near the end was there an actual hole on the ground.

Toshio simply dropped down, pushing his way into the thick foliage. "Don't worry, there's no way of getting stuck. Come on," he encouraged, leading the way-- if only counting on the fact that Niko was worried when he nearly fell off the tree. Someone like that wouldn't let a kid crawl into a bush tunnel so deep that, at points, there was no sunlight peering through the plants.