Reviews were overwhelmingly positive, although some criticism arose around accusations of "faking" footage, most notably by New York Times reviewer Bosley Crowther, who questioned the authenticity of two of the more dramatic scenes. He stated in his 1964 review, "Oceanographers consulted here yesterday said it was highly unlikely that a deep-sea cavern, containing a "bubble," or pocket of air, at its top, could exist. If it did, the atmosphere in that bubble would surely be noxious, they said. It would be methane or marsh gas. And the pressure in it would be intolerable for man."World Without Sun (1964), The New York Times, December 23, 1964
