https://geoforming.com/solutions/systems-for-tunneling/solutions-for-ground-and-water-challenges-during-tunnel-boring-with-tbm/
Waterproofing of the sealing ring tunneling
https://geoforming.com/solutions/systems-for-tunneling/solutions-for-ground-and-water-challenges-during-tunnel-boring-with-tbm/
Solutions for Ground and Water Challenges During Tunnel Boring with TBM
geoforming.comWaterproofing of the sealing ring tunneling