Construction Karawanks Motorway Tunnel East Tube, Slovenia photo DARS via Wikipedia https://en.wikipedia.org/wiki/File:Predor_Karavanke_Construction_Site_19.jpg

Construction Karawanks Motorway Tunnel East Tube, Slovenia (photo DARS wikipedia https://en.wikipedia.org/wiki/File:Predor_Karavanke_Construction_Site_16.jpg)

Construction South Portal Second Tube Predor Karavanke , Slovenia (by DARS from Wikipedia https://en.wikipedia.org/wiki/File:Predor_Karavanke_Construction_Site_15.jpg)

KRRI Survival Tunnel, Survival Passage Unfolded Korea Railroad Research Institute

KRRI Survival Tunnel, Survival Passage Korea Railroad Research Institute

KRRI Survival Tunnel, Survival Passage Korea Railroad Research Institute

Sacyr Tremezzina Italy - from Sacyr

Artists impression of RTS Link viaduct in Singapore (lta.gov.sg)

RTS Link viadut and tunnels location in Singapore (lta.gov.sg)

Cemex image for Tideway deliveries   source media release : https://www.cemex.co.uk/-/cemex-supplies-over-40-000-tonnes-of-primary-sprayed-concrete-to-london-s-super-sewer-project