Producer Alex Gordon wanted to hire veterans Frank Lackteen and Edmund Cobb as passersby. The studio objected to the $100 salary for each, contending that they were functioning as extras and were only entitled to $20. Wanting these old-time actors to get a day's pay, Gordon paid them out of his own pocket.
The film inspired Voyage to the Bottom of the Sea (1961) and the TV series Voyage to the Bottom of the Sea (1964). It was also remade as an episode of that series.
The trailer for this Allied Artists release played down the science fiction elements and made it look more like a military action film.
Producer Alex Gordon claimed that the production averaged 50 set-ups per day and on one occasion did 72.
The alien being from his film was the inspiration for the aliens Kang and Kodos in the hit animated television series, "The Simpsons"
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