‘First-person view’ drone footage shows the completed excavation of the huge underground box structure 20m below ground at HS2’s Old Oak Common, in west London.
The excavation, which was completed this month, has taken three years and was undertaken section by section within the box, starting from the west and the east of the structure and meeting in the middle.
The vast underground box has a 1.8km fibre-reinforced concrete diaphragm wall around it, and 1.3m tonnes of London Clay has been removed from inside – enough to fill over 300 Olympic-sized swimming pools.
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