^ Not underneath, but on the outer-side of the steel rectangular border surrounding the hole. In this photo (http://i.imgur.com/5YyXSPI.jpg), where there's a shadow on the right side of the steel border that surrounds the hole -- that's where the hatch would be attached; like it is on the tank in front. Since the photo looks directly down the hole, it's tough to say one way or the other, but a hatch can not be definitely ruled out, since the angle of the picture is an overhead view.