Hold on to the handrails when you are on the escalator of the metro in Tbilisi. I encountered the escalator stopping abruptly two times, during one of my short weekend stay in the capital. The long, deep, speedy escalator heading underground had then appeared in my nightmare.
(Adley) we saw this kind of deep subway in many capitals of past-soviet countries like Ukraine, Romania, Bulgaria, Hungary, Czech Republic, Slovakia. I wonder it related to war-like mentality (during the cold war) to use the subway for military mobility and shelter.