TOPSFIELD (CBS) — Firefighters pulled an injured man out of a hole that opened up after the concrete floor of his screened-in porch collapsed Monday evening.

The Topsfield Fire Department said the man, who called 911 himself after the floor collapsed around 5:49 p.m., was trapped in the hole, which was about 12 feet wide and 12 feet deep.

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Because hundreds of pounds of concrete were hanging above him, firefighters had to be carefully lowered into the hole to pull the man out.

The injured man was trapped in a hole that was 12 feet deep. (Topsfield Fire Department)

The injured man was trapped in a hole that was 12 feet deep. (Topsfield Fire Department)

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“Time was of the essence, we evaluated the risks against the benefits of entering the collapse zone to remove the patient,” Topsfield Fire Chief Ronald Giovannacci said in a release. “It was appropriate to put ourselves into a dangerous area to quickly remove the victim from the danger.”

It took about 20 minutes for rescuers to secure the man, and he was then pulled up a ladder via a rope and basket.

Chief Giovannacci said the victim suffered only minor injuries, and was lucky to have had his phone with him.

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A building inspector was notified of the unsafe collapse area.