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The measure also allows state agencies to waive restrictions on hazardous work for 16– and 17-year-olds, including demolition, roofing, excavation, and power-driven machine operation.

"Archaeological excavation gives us an insight into the people who lived here, what they were doing and sometimes what their social status was," Mr Capon said.

Heavy excavation machines bash giant concrete blocks into more manageable chunks, before grinders pulverize the material into 1- to 3-inch rocks, which can be recycled.

Three trenches were selected for excavation with volunteers digging, scraping and brushing deep into the earth in search of evidence.

Three seals from Banerjee's excavation bore images and scripts similar to those from Harappa in the Punjab province in present-day Pakistan.