Neutrino research is so cool. SNO+ is entering a new phase this year, with a new scintillator fluid that might allow us to determine their Majorana status. Always cool to realize how much is still unknown, and how tenuously we “know” anything.
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The Soviet detector mentioned is probably https://en.wikipedia.org/wiki/Baksan_Neutrino_Observatory
There is a tour of it on youtube https://www.youtube.com/watch?v=J5jhp74Uw54 if you happen to speak some Russian. The scintillator array part starts around 22min