Herrenknecht AVN1200 breakthrough for TENP project in Kehl, Germany from Herrenknecht official media release information at https://www.herrenknecht.com/en/newsroom/pressreleasedetail/breakthrough-on-the-pipeline-construction-site-in-kehl/

https://www.herrenknecht.com/en/newsroom/pressreleasedetail/singapore-tunnelling-for-sewage-superhighway-completed/

SAIMM - Herrenknecht Seminar https://www.saimm.co.za/saimm-events/upcoming-events/herrenknecht-seminar

PORR Elbe Tunnel for SuedLink © TenneT TSO GmbH used for its inclusion in PORR press release. https://porr-group.com/en/press/press-release/news/porr-wins-major-contract-for-elbe-crossing-in-suedlink-project/

Deutsche Bahn Fürth Güterzugtunnel map from https://www.bahnausbau-nuernberg-bamberg.de/

Deutsche Bahn CO2 emmission comparisons Deutsche Bahn Fürth Güterzugtunnel brochure from DB project Mediathek...

 Deutsche Bahn Fürth Güterzugtunnel copyright:  Deutsche Bahn Obtained from  Deutsche Bahn Mediatheek...

from KraussMaffei' press information https://press.kraussmaffei.com/en/news/from-the-sea-into-the-tunnel-kraussmaffei-customer-oldroyd-uses-100-sea-plastics-for-its-products

from KraussMaffei' press information

Brenner Base Tunnel TBM Lilia press release https://implenia.com/en/media/news-article/lilia-die-erste-tunnelbohrmaschine-zum-bau-des-brenner-basistunnels-ist-startklar/