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Other heavy construction equipment including excavators and sluice and slurry pumps were brought in, as well as technical experts and "several hundred tons of gravel and earth", the US Army said.

Throughout Friday night and into Saturday morning, drones, sniffer dogs, cranes and excavators were brought in to help with the rescue effort.

To vacuum up the treasured nodules requires industrial extraction by massive excavators.

Nearby, excavators found iron slag - some of it fused to the furnace wall - hinting at advanced metalworking techniques.

Workers operated excavators to pull large objects and mangled metal from building foundations, tossing the debris into freight containers.