As probably someone's diorama plot.
Last home Big Anti submarine ship "Kerch"
https://en.m.wikipedia.org/wiki/Russian_cruiser_Kerch
and the submarine B-380 (previously called "Gorky Komsomolets" and "Holy Prince George")
https://ru.m.wikipedia.org/wiki/Б-380
(From Wikipedia about B-380:
"On December 14, 2019, the decommissioned large floating dock PD-16 sank with the B-380 submarine located in it. In the morning, December 15, 2019, the B-380 submarine surfaced on its own and lay down on its port side, resting its cabin against the floating dock in the South Bay of Sevastopol [10].")
in Inkerman Bay:
Resource:
https://colonelcassad.livejournal.com/5850686.html
B.R.
Serge