Okay, if you were faced with the sand challenge, would you have attacked the way the racers did?
Personally, once I figured out it was going to be a long challenge, I would have at least gone around the sand poking my shovel in just in case I got a hit. Then I would have tried pushing my shovel in, and dragging it from rope to rope in rows. It might have worked - the scarabs didn't seem like they were buried that deep.
I keep seeing the Bowling Mom with that huge pile of sand next to her.