Sub-Mariner Comics #11 (1943)

With supply ships heading to China being sunken by Japanese fleets. When the news reaches the Sub-Mariner, he wonders how the American battleship protecting the convoy could so easily be taken down. Swimming out to the location of the most recent attack, Namor finds an interesting thing: There appears to be one more supply ship than reported and part of its American flag had been weathered away revealing a Japanese one underneath. The Sub-Mariner heads to navy intelligence and arrives just as they have made a decision to ask him to accompany the next supply convoy that is due to head to China in two days. Meanwhile, in Japan, Emperor Hirohito meets with his agent Yoko, the man in charge of the operation. He instructs Yoko to go out and destroy the next convoy heading to China and instructs him that failure should end in death at his own hands. When the American fleet is attacked by a fleet of Japanese battleships, the Sub-Mariner dives into the ocean to lend a hand. Spotting a cargo ship among the Japanese fleet, Namor swims up to investigate. He then clashes with Yoko and his men, just as American and Japanese fleets begin to clash. Namor realizes that the Japanese are sneaking in a dummy supply ship to sink the American fleets once they get away from the battle. Before Namor can do anything, Yoko drops the hook of a supply crane on his head, knocking him out. Yoko and his men chain up Namor and take him inside the vessel, which is actually a shell disguising a Japanese submarine. When Namor comes around he uses his strength to break free from his bonds. He then sneaks to the ballast, causing the sub to surface revealing its true nature to the American fleet. Noticing this, Yoko and his men track down the Sub-Mariner who attacks them as the American fleet begins to fire upon their vessel. Yoko and his crew manage to get the vessel to dive just as the fleet lands a direct his on the decoy shell, destroying it. Namor manages to subdue Yoko's crew and then takes control of the ship and forces it to surface once more. When Yoko attempts to commit suicide, Namor stops him and pulls the knife out of his hands. Namor then uses the Japanese sub to attack the fleet of Japanese battleships. When the Japanese return fire, the Sub-Mariner abandons ship and leaves Yoko and his crew to die when the vessel is sunk. Namor then swims to the only remaining Japanese ship and captures its admiral and turns him over to the American fleet. With the battle over the convoy makes its way to China where Namor is thanked for his help.