No one expects rocket science out of these grade school dropouts. Still, their brand of lowbrow comedy survived, even into the age of TV, big screen Technicolor, and blonde sex goddesses. Sure, Leo's got a middle-age spread, while Huntz is hitting 39. So, calling them "boys" requires a bit of squinting. Then too, the gang has dwindled to just four aging delinquents, plus granddad Bernard (Louie). But, truth be told, DTU is a pretty funny entry, thanks to some good set-ups and location work, snappy dialogue, and a capable supporting cast. That Sach-trapped-on-a-real-ledge scene is particularly well done, where economy would usually employ a cheesy set.
Note too how the boys are after uranium and not gold or silver or even oil. There was a brief Cold War period when atom bomb uranium was the object of weekend prospectors instead of the more usual precious metals. A Geiger Counter to register radio- activity was all that was needed. I guess my only complaint is about the billing. Why fellow 1930's youth actor Carl (Alfalfa) Switzer isn't credited seems odd. He's got an extended speaking part (Shifty) that should merit listing in the credits, which might also have helped his faltering career. Although their comedy act may be tired, the boys still show a lot of spark, making this one of their better later features.