Earth is piled up at the site of a ventilation shaft for the Chiltern Tunnel on the HS2 high-speed rail link on 18th July 2020 in Chalfont St Giles, United Kingdom. The Department for Transport approved the issuing of Notices to Proceed by HS2 Ltd to the four Main Works Civils Contractors MWCC working on the £106bn rail project in April 2020.