I've had a pleasure to be contacted by James A. Hamlin, WW II veteran, who generously agreed to share his memories about his stay in Severodvinsk (former Molotovsk) during WW II. James's ship docked in Molotovsk to unload cargo for about a month in December 1943.
Following are the documents that he provided to me.

James on the photo taken during the WW II.

In February 1996, James have been awarded the Commemorative medal "The 50th Anniversary of the Victory in the Great Patriotic War" (World War II) by Russian Government.

Report from Life magazine (part 1 and part 2) published around 1944-1945 paints a picture of what Severodvinsk was a few years into its existence.

Article from The Armed Guard Pointer as of May 1945, tells about stay of American crew in Molotovsk in fall of 1944.

James's own account of his stay in Molotovsk (part 1 and part 2)

Radiogram from December 28, 1943 about sinking of German battleship by British fleet was copied by James, who served as United States Navy Radioman.

Please contact me if you know anybody who was a prisoner of Yagrinlag in Molotovsk or have any information about the camp.