"Invasion!!" (G-556). (Note: this is not the same story as that from issue #35, despite the same title).
At home in his native Antarctic waters, Namor grows suspicious of the unnatural fog that has set in. He discovers that the Communists are generating the fog to cover their operations. The Sub-Mariner surrounds the Soviet fleet with icebergs, and pound the Soviets into submission. 8 pages.
Reprinted in Marvel Super-Heroes (Vol 2) #13.
No Title Given featuring the Sub-Mariner (G-913).
Young Namor, while exploring the ice shelves near home, meets and befriends the Ice King. Nobody believes him, but when a food shortage comes, Namor turns to his friend for help, and the crisis is averted, a mystery to all but Namor. 4 pages.
"The Last of the Vikings!" (G-725).
In the waning days of sea-faring Vikings, the last Chieftain tells his son that his course is run, and goes to sea to die in the Viking tradition. His son refuses to let it be, and gives his father reason to live on. 4 pages.
"When the Light Goes Out!" (G-626).
A lighthouse keeper is accosted by thugs, who extinguish the beacon just as a prison transport ship is due by. The transport crashes, and the escape attempt is underway. Namor notices the wreck, saves the crew, and mops up the thugs who hole-up in the lighthouse. 7 pages.