Coupled with new armament and sensor fit, the Tango class was ideal for ambush operations against Western nuclear submarines at natural chokepoints.

[1] B-380 had been in layup in Sevastopol Harbor awaiting either refit or scrapping as of 2008, but during the night of December 14–15, 2019 the floating dock PD-16, which contained B-380, sank.

B-380 capsized to port and partially sank, and by 19 December it was still unclear whether the submarine was afloat or resting on the bottom.

[citation needed] By October 2021, the sail of submarine B-380 had been installed, with the assistance of the Russian Maritime Tradition Club Association, at the Mistral Hotel & Spa, Intra district of Moscow.

[1] Three 641B-class submarines operate as museum ships: The conning towers of stricken B-319' and B-474 are on display in Polyarny and Ryazan.