If enough people drive vehicles off the south rim one or two are going to survive.

Reminds me of the old story from WW2 where a heavy bomber flying over the Alps starts falling apart. Everyone gets out except for the tail gunner. The plane is on fire but he doesn't have a parachute. Preferring a quick death he jumps. As it happens he falls on the near-vertical face of a glacier and slides down the slope. he ends up in a pile of snow with a broken ankle. Very lucky.

Drop enough people and one or two get the super-special winning lottery ticket.