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Video of the "RDS-37" are often confused with video of the Tsar Bomba, although they can be quite similar. RDS-37 video have the initiation moved to the center, and Tsar Bomba video have the initiation moved to the right (except for the mushroom-cloud video, which is in the center). In addition, the "RDS-37" test occurred in the Semipalatinsk test area, and some of the video looks across the roofs of the secret city of Kurchatov, aka Semipalatinsk-16. The "Tsar" occurred over the southern half of the Arctic polar desert island of Novaya Zemlya, with no similar population centers within hundreds of kilometers at that time.