Iron Man Annual #10 (1989)

At a Lemurian rebel outpost, Ghaur explains his plan of world domination to Attuma. By combining forces of Ghaur's deviant mutates, Llyra's Lemurians, and Attuma's Atlanteans, they could weaken the surface world to prepare it for when Set returns after they have reassembled the Serpent Crown. Krang sees possibilities and a plan is formed. Meanwhile, Iron Man follows two Maggia mini subs, which are in turn following a boat. The boat is approached by Namor who is looking for his late wife's spawn, but the crew reveal themselves to be Hydra agents and attack him. The Maggia mini subs flee and Iron Man assists Namor; as it becomes clear they cannot stop the heroes, the Hydra agents destroy the boat. Later, Attuma's man approach the Panama Canal while Namor meets with Stark at Stark Enterprises. They determine that the boat that was destroyed was heading for Panama, so Namor and Iron Man leave to check it out. Namor discovers signs of clandestine movement along the ocean floor, while Iron Man finds that the company that owned the destroyed boat is a Hydra front. He breaks in and learns that Hydra is planning to flood the American market with a new designer drug, addicting the entire country to facilitate Hydra taking it over. He subdues the agents and destroys the main supply. Leaving to stop the outgoing shipment, Iron Man is met by Namor, who has discovered Attuma's forces and realizes there is an impending attack on the Panama Canal. Iron Man fights the Atlantans while Namor stops the Hydra drug shipment. Despite the Atlanteans using their Omega rocket against Iron Man, he fends off the attacking army until the U.S. Air Force arrives. Iron Man then leaves to help Namor, but the Hydra agents destroy the boat, apparently killing Namor in the process.