Wagner boss says he wants Bakhmut in Ukraine for its 'underground cities'
Moscow's grinding push to try to take Bakhmut has puzzled some Western military analysts who say heavy losses on the Russian side and Ukraine's defensive lines mean any Russian victory there would be pyrrhic.
Flooding complicates gathering evidence from underground facilities.
https://tripmustgoon.com/en/osokorovsky-catacombs
(pics from 2004) https://www.abc.net.au/news/2023-01-14/bakhmut-soledar-salt-mine-tunnels-yevgeny-prigozhin-wagner-group/101845462