Hi CDH, good interesting answer. People from temperate climes, like myself, would not have thought of that. I continue to learn!

The Portovyy will soon be used as a floating storage near Saint Petersburg, Russia. The vessel will be moored to starboard. New port-side fender to protect hull from winter ice pressure

Interesting addition to the hull which seems to be only to the portside. It would be interesting to know the purpose of this addition, if anyone knows when it was done and why.