as he continued on over the relatively safe central area he noticed a long flat area in front of him , so with adrenalin now pumping he eased the bell even lower for a spot of high speed low level flying , and as he skimmed a few feet above the sand he mulled over in the back of his mind that perhaps he was the first person in hundreds , if not thousands of years to be in this area , and then halfway across the plain , out of the corner of his eye he noticed something very peculiar in the side of the valley wall , a door , so he slowed and side slipped over to it , and was astonished to find a large hangar like structure set into a cut in the valley wall .