In the photo Isaac is seen lying on the soft grass bedding that covered the floor of the rear half of the cave. The bedding covered an area the size of 3-4 king size beds. The grassy bedding was soft and comfortable, and was roughly 1 foot deep from wall to wall.
This cave is nearly 40 feet deep, 10 feet wide, and 7 feet high at the entrance. It tapers quickly to a height of 4 feet and maintains that height nearly to the back of the cave.
This cave was not created by the flow of water.