Moscow Big Circle Line - Moscow Mayor Official Site under a Creative Commons Attribution 4.0 license. from:https://www.mos.ru/en/news/item/101314073/

NTB Norway Nye Veier 7 tenders in 2022  - NTB press release on 19 January 2022.

Singapore Land Transport Authority CCL6 T Cantonment and Keppel Stations (LTA press release)

Singapore Land Transport Authority CCL6 Tanjong Pagar Station (LTA press release)

Singapore Land Transport Authority CCL6 Map (LTA press release)

LTA CRL1 Aviation Park Station and Changi East Depot plans -  Singapore LTA press release

Tunnel. Vegtilsynet pressemelding. Image is courtesy of Vegtilsynet. It can only be used with the press release of Vegtilsynet it is associated with.

Szczecin tunnel Oder river location  (from GDDKiA media release)

Szczecin tunnel tubes under Oder river  (from GDDKiA media release)

Szczecin tunnel location on map (from GDDKiA media release)