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Ontario’s Labour Ministry is investigating the third construction emergency on Ottawa’s LRT tunnel project after three underground workers were trapped on a lift Thursday by buckled steel.

The incident, which LRT contractor Rideau Transit Group characterized as minor, happened about 100 metres from the tunnel portal near Laurier Avenue and Waller Street at around 4:30 p.m.

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Paramedics took one worker to hospital with a hand injury. The other two workers didn’t require treatment.

Peter Lauch, technical director for RTG, said the workers were on a lift spraying concrete onto a wall when some reinforcing steel became intertwined with the lift’s basket. The workers became stuck in the air.

“Some of the reinforcing steel started to buckle,” Lauch said. “It trapped the workers in the lift.”

Nothing fell from the top of the cavern onto the workers.

“They were nowhere close to the ceiling. They were strictly up along the wall,” Lauch said.