Construction of a tunnel or bridge across bay in Sevastopol is unlikely in 5 years. Project cost estimated 40 billion rubles.  High cost result for delay.

Governor Dmitry Ovsyannikov had suggested building a tunnel under the Sevastopol Bay in 2017 to Russian President Vladimir Putin. But a study "bridge or tunnel" prefer bridge.

https://expertsouth.ru/news/stroitelstvo-mosta-cherez-bukhtu-v-sevastopole-otlozhili-do-2026-goda/