How about a Trench Digger?greenspun.com : LUSENET : Junkyard Wars : One Thread
Teams would have to build a machine to dig a trench. 2'x2'x2' (or whatever dimensions the producers decide). First one to dig a 60 foot long trench wins.
-- John Hickey (email@example.com), March 05, 2001
or maybe dig for treasure using some sort of backhoe or boring machine
-- staleblende (firstname.lastname@example.org), March 06, 2001.