Quarry

If you look to the far end of the lake, you can see a small object floating in the water. That was the boat that ferried the frogman out into the water so he could assist in bringing the car back to the surface. The car was launched not from the top of the cliff, but from the road that is cut into the rock and descends to the bottom of the pit. I'm not 100% sure, but I think that's at least 100 feet above the water.

When Fast Five is released I'm told that we will see a railroad bridge (digitally rendered as a special effect) spanning the quarry.