Thanks for the link. That lighthouse is absolutely fascinating. I never knew they put nuclear energy into a lighthouse.
I was reading some of the comments and thought this little exchange was funny.
OMG Russians are so poor they can’t even maintain thier own coastline and lighthouses. Its such a pity. Is that why there has been a recent surge in ship wreck, sunken submarine in russian waters? 
Yes, that is EXACTLY why the submarines sunk, because the lighthouses were out of order. Lighthouses are crucial for submarine navigation.
Oh yeah, underwater lighthouses, I get it……