B-39 was a Project 641 (Foxtrot-class) diesel-electric attack submarine of the Soviet Navy. The "B" (actually "Б") in her designation stands for большая (bolshaya, "large")—Foxtrots were the Soviet Navy's largest non-nuclear submarines.[1]
In 2005, B-39 became a museum ship on display at the Maritime Museum of San Diego, California, United States. In October 2021 the decision was made to withdraw the deteriorating submarine from the collection and scrap her.[2]
In 1989, in the Sea of Japan while charging batteries on the surface, B-39 came within 500 yards (460 m; 0.25 nmi) of an Oliver Hazard Perry-class frigate of the US Navy. Both crews took pictures of each other.[3]
When B-39 was made a museum, the shroud around her attack periscope was cut away where it passes through her control room. As built, a Foxtrot's periscopes are only accessible from her conning tower, which is off-limits in the museum. With the shroud cut away, tourists could look through the partially raised periscope (which is directed toward the USS Midway museum, some 500 yards (460 m; 1,500 ft) away). However, the unidentified and unexplained change gave the false impression that one periscope could be used from the control room.[citation needed]
In 2010, B-39 was proposed to be sunk to create an offshore diving reef,[4] but an outcry from teachers and enthusiasts ensured the sub would stay on display a while longer.[5]
During the 2010s, B-39 had become badly rusted with large holes visible in the outer hull and upper deck. In October 2021, the Museum decided to withdraw the submarine from its collection. On February 7, 2022, she headed out to Ensenada, Mexico, to be scrapped.[2]