Acciona TBM breakthrough in Line 9 of Barcelona, Spain source Acciona press release https://www.acciona.com/updates/articles/acciona-celebrates-new-breakthrough-line-barcelona-metro/?_adin=132415900

Ajuntament de Barcelona Glories tunnel air quality improment table 2 Ajuntament de Barcelona Servei de Premsa...

Ajuntament de Barcelona Glories tunnel air quality improment table 1 Ajuntament de Barcelona Servei de Premsa...

COMSA Montcada i Reixac railway tunnel contract https://www.comsa.com/en/infrastructures/comsa-ejecutara-las-obras-para-el-soterramiento-del-ferrocarril-en-montcada-i-reixac/

Spain Mitma diagram for AC-14 road connection with AP-9, in A Corua from Mitma media information.

Toad reconditioning between the Balupor and Fiscal tunnel https://www.mitma.gob.es/el-ministerio/sala-de-prensa/noticias/mar-19092023-1213

Mapa situación túnel de Ortega Prados MITMA: https://www.mitma.gob.es/el-ministerio/sala-de-prensa/noticias/vie-25082023-1233

Mapa situación de los túneles de Casabermeja 1,2,3 y 4 MITMA: https://www.mitma.gob.es/el-ministerio/sala-de-prensa/noticias/vie-25082023-1233

Ferrovial Barcelona Tunnel (cropped) https://newsroom.ferrovial.com/en/press_releases/ferrovial-extend-fgc-line-8-barcelona-e300-million/

Mitma N-260 tunel https://www.mitma.gob.es/el-ministerio/sala-de-prensa/noticias/mie-28062023-1616