Siemens

Øresund Strait (from Region Skåne press release)

Fixed HH Link (marked with circle) environs. It is from Region Skåne press release supplements.

CREC press news release

Firth of Forth Tunnel as proposed by Scottish Greens.  image: Deltix Transport Consultancy (from Rail for All report commissioned by Greens)

Barcelona L9 Metro line Vinals, CC BY-SA 3.0, via Wikimedia Commons

Altona tunnel Hamburg, from Implenia

J.Kumar is winner of Metro Rail Contractor of the Year 2020 image cover of J.Kumar annual report

Ontario Line subway - Metrolinx

Faroe Islands Eysturoy Tunnel I did the composition and some markings by using screen shots of Duckduckgo map.