Despite the removal of thousands of tons of steel and other debris from the remains of the Didcot A power-plant boiler house after a sudden Feb. 23 collapse killed four workers, three have not been located. Crews recovered Michael Collings’ body soon after the accident. The event occurred during demolition of the defunct plant, leaving some 17,000 tons of debris and about 20,000 tons of structure still standing, says owner RWE npower. The remaining building is unsafe and will be demolished once the remaining bodies are recovered, it adds. Site demolition contractor Coleman & Co. has removed a large proportion of rubble. But U.K. media reports say a new firm will replace it to demolish the rest of the boiler house. The cause of the collapse is still being probed.