At least two of the Crossrail TBM shields were buried: https://learninglegacy.crossrail.co.uk/documents/c300-western-running-tunnels-caverns-project-tbm-shield-

At least two of the Crossrail TBM shields were buried: https://learninglegacy.crossrail.co.uk/documents/c300-western-running-tunnels-caverns-project-tbm-shield-burial-backup-removal-2/ https://learninglegacy.crossrail.co.uk/documents/c300-wester...