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Robbins main beam breaks through Ohio River Tunnel
Crews celebrated as a 6.7m (22-foot) diameter Robbins Main Beam TBM broke through the Ohio River Tunnel.
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.khl.com/international-construction/robbins-main-beam-breaks-through-ohio-river-tunnel/146542.article
Robbins main beam breaks through Ohio River Tunnel
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