Catching up on posts I missed. Obviously they drive through the middle of those holes on purpose, for the adventure of it I guess. I could navigate that go-round in the FJ, but I would not try the hole. I've been in some pretty deep ones, with water well up over the door sills. Fortunately the FJ has awesome door seals, and I've never had a drop come into the cab that way.
The thing about the holes up around High Crossing and Quarter Mile is that the mudders dig really deep ruts in the bottom when they power through. If you aren't running 33's or larger, and you try to follow the main path through, you risk hanging the differential up on the ridge, which is probably what happened to that guy in the pic. Or maybe he just tried to drive through too fast and ingested some cedar water.