Satisfied that Speed and Trixie are dead at the bottom of Lake Icy Chill, the Mammoth Car drivers continue the race. Through Speed's telescanner, he sees them leave as he reaches soil. Trixie now sends a message in the homing robot to Inspector Detector. Speed strongly suspects that the stolen gold is aboard the Mammoth Car. From his plane, Cruncher Block spots the Mach 5 back on the road. Speed and Trixie are fired upon at the refueling station. When they escape into a mining tunnel, they jump on top of a speeding trolley car before it crashes...