When I was gathering locations for the Armenia trip with Poison, these tunnels were priority. I found out about them years ago, but never researched the location. By the time Poison and I met up in the country, I still wasn't sure where they were exactly. It took a couple days, but I managed to track down the location of both entrances and we immediately went to check them out. The metro is a highly protected infrastructure in Armenia and we were paranoid about running into trouble while sneaking around it. Luckily the active parts were walled off pretty well and the abandoned tunnels didn't seem to be protected from the inside.