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Tunnel Breakthrough Moments
Gotthard - Tunnel Boring Machine (TBM) Breakthrough at world's longest tunnel under Swiss Alps
571 views
By
Ali T. Bashar
2064 days ago
Gotthard base tunnel
Tunnel Boring Machine Breakthrough
TBM Breakthrough
Tunnel Boring Machine (TBM) smashes open world's longest tunnel under Swiss Alps
Tunnel Breakthrough Moments
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