Tales to Astonish (1959-1968 1st Series) #92
Published Jun 1967 by Marvel.

Cover by Don Heck and Dan Adkins. "It Walks Like a Man!", script by Stan Lee, art by Dan Adkins
When a passing ship dumps a radioactive barrel into Namor's realm, he realizes the danger it poses and takes it far away from Atlantis to throw it into a deep crevasse; Little does he know that the radiation in the barrel has awakened an ancient monster who begins to menace both the surface world and the world beneath the waves alike.

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