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Good news in lockdown times: Metro completes India's deepest air shaft | Kolkata News - Times of India
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This is how the subway is „breathing” | Official website of the reconstruction project <br>of metro line M3
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File:Ventilation shaft of Chkalovskaya metro station (Венткиоск станции Чкаловская) (6633501979).jpg - Wikimedia Commons
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File:Ventilation shaft of Geologicheskaya metro station (Венткиоск станции Геологическая) (6969304453).jpg - Wikimedia Commons
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This is how the subway is „breathing” | Official website of the reconstruction project <br>of metro line M3
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