Yesterday I was given exclusive access to the preparation work that's going on for the Crossrail tunnelling.
Millions of pounds are being spent on archaeological and geological surveys across the capital and they're coming up with some striking findings.
The archaeologists are currently working outside Liverpool Street Station.
Behind some metal hoardings - yards away from the 205 bus route - they've been digging trenches where Crossrail's ticket hall will be.
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