Rostov-na-Donu is a diesel-electric submarine of the Improved Project 636.3 class of modern Russian ships.

B-237 was built in Saint Petersburg shipyard, laid down on 21 November 2011, launched on 26 June 2014 and commissioned on 26 December 2014.

[13] Based on open-source imagery, the UK Ministry of Defence assessed that the submarine had "likely suffered catastrophic damage".

Two large breaches in the hull of the submarine could be seen, one around the midpoint of the starboard side to the rear of the conning tower and another on the top bow.

[18] Ukrainian forces claimed Rostov-na-Donu "sank on the spot" after a drone and missile strike on Sevastopol that also damaged an S-400 launcher.