CS #521 Monster from Green Hell (1957

CS #521 Monster from Green Hell (1957

) is a quintessential B-movie that leans heavily into the "giant bug" craze of the era.
Here are the key details on those mutated wasps:
The Origin: American scientists Dr. Quent Brady and Dan Morgan launch various animals—including wasps—into space to test the effects of cosmic radiation. A rocket malfunction leads to the wasps being exposed to radiation for 40 hours before crashing in the African jungle.
The Mutation: The radiation causes the wasps to grow to "Panzer tank" size, becoming massive, flightless killers that terrorize a region the locals call "Green Hell".