After losing his watch while hiking over a creek, Garrett and Reichard's friend Eric designs a remote-controlled video submarine.
The guys test out the DUS-T's ability to protect the user from from a harmful substance. Will the DUS-T keep scotty safe from pepper spray?
An inventor tests his homemade jet pack with fiery results.
The guys build an air cannon and launch chunks of ice at a junk car to illustrate what kind of damage hail does to an unprotected car.
Download the TV Guide app for iPhone, iPad and Android!