Tales to Astonish (Marvel, 1959 1st Series) #98

Cover by Dan Adkins. To Destroy the Realm Eternal!, script by Roy Thomas, art by Werner Roth and Dan Adkins.

Namor returns to Atlantis only to find it under attack by the Plunderer. As the two parties clash, an American sub overhead senses the vibrations and begins to drop depth charges in case it is the Sub-Mariner intent on attacking them!