Mary’s Got Backup: Gantries Head Underground @MyDCWater
Mary’s Got Backup: Gantries Head Underground @MyDCWater
Uploaded August 2026 | Updated September 2026, 2 hours ago
The gantries that support Mary the Tunnel Boring Machine are heading underground!

These connected platforms will follow behind Mary as she digs, carrying the critical equipment and systems needed to power, control and ventilate the machine.

Their installation brings DC Water another step closer to tunneling beneath the Potomac River as part of the Potomac River Tunnel project.
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Mary’s Got Backup: Gantries Head Underground

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