The final Corvette... #8 of the "Great 8" has been found! The Mallett Hammer is upside down with the nose going to the Spire in the center of the room. There are lots of rocks, so the removal process will be more time consuming that it was with the other cars.

boulders

Boulders off by the digger arm is what they had to move to get to the Hammer Corvette.