Why the salvage ship Kommuna remained useful

How can the Russian salvage ship Kommuna still remain in service after so long?

Its specialized salvage function still worked, and the ship was used relatively little.

Kommuna is a salvage auxiliary with a twin-hull arrangement designed to lift or recover vessels. Its continued service is attributed to that specialized function still working and to the ship receiving little use. Its longevity therefore needs to be considered in the context of its limited salvage duties.