I sure hope that tomb is water tight,with my luck it would fill up with the first big rain,with the cars in it.
I'm sure he factored that into the design and has a run-off area for water underneath. It'd be awesome if it lifted up really fast because if you were ever in a car chase or something and wanted to hide from the cops, you'd just have a friend lift up your driveway for you and quick duck in there and lower it before anyone knew what happened! Kinda reminds me of the bat cave!
OK you got the water thing figured out,what do you do if it breaks while in the down position? Its cool don't get me wrong, I just wouldn't keep anything of value in it,like two Lamborghini's.