UPDATED: Aug. 14, 2014 8:30 p.m.

POTOMAC, Md. (WNEW/AP) — Dozens of rescue personnel worked for more than three hours Thursday evening to free two workers trapped up to their necks in mud when a trench collapse pinned them to the foundation of a Potomac home.

The two workers became trapped in wet mud after the 15-foot deep trench gave way at the home in the 10900 block of Martingale Court, according to Montgomery County Fire spokesperson Pete Piringer.

At least one of the men was given oxygen as crews worked to shore up the unstable ground before attempting an extrication, footage from a news helicopter above the scene showed. The men were doing work on the home that required digging down to its foundation.

The workers were conscious and breathing throughout the rescue, which involved more than 50 workers.

The men were taken to Baltimore Shock Trauma with serious, but non-life threatening injuries after being freed around 8:10 p.m., officials say.

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