Sub-Mariner Volume 1 #68

Namor returns to his underworld realm to find it devastated in the wake of the nerve gas contamination; Fortunately, his subjects are just in a comatose state and amphibian scientists are eager to help them; Namor takes the scientists to Dr. Hydro's island base and then seeks out Dr. Walthers who has been working on a force field device that can protect Atlantis from any other nerve gas contamination; However, the costumed villain Force stands in his way. Namor drives him off and continues his search for Dr. Walthers.

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