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14 photos Metro station 8 II, part of the Second metro diameter of Sofia, Bulgaria Read more -
5 photos Metro tunnel between MS 18 and MS 19, Sofia, Bulgaria Read more -
7 photos Metro tunnel between MS 10 and MS 11, Sofia, Bulgaria Read more -
2 photos Metro tunnel between MS 13 and MS 18, Sofia, Bulgaria Read more -
6 photos Metro Station 13 Read more -
4 photos Breakthrough of tunnel BÜHLTUNNEL Read more