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Firefighters in California work to rescue a man who is stuck in a large hopper of dry cement.

Firefighters in California on Thursday night rescued a man after he became trapped in a cement mixer for hours.

A supervisor at U.S. Pipe in Union City was looking into a concrete hopper silo when he lost his balance and fell into it, a worker told Fox 2 KTVU.

The Alameda County Fire Department said first responders performed a "technical rescue" to pull the man out of the hopper.

"He's been secured w/ a harness to prevent him from sinking deeper & crews are draining product from the bottom of the hopper to alleviate the dry cement from around the patient," the department tweeted.

The man was finally rescued roughly two hours later, around 6:45 p.m. local time.

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This material may not be published, broadcast, rewritten, or redistributed. ©2022 FOX News Network, LLC. All rights reserved. Quotes displayed in real-time or delayed by at least 15 minutes. Market data provided by Factset. Powered and implemented by FactSet Digital Solutions. Legal Statement. Mutual Fund and ETF data provided by Refinitiv Lipper.