Although none of the characters in The Tunnel share their names with equivalent characters in The Bridge, many names are similar. Martin Rohde becomes Karl Roebuck, his son August becomes Adam. Daniel Ferbe becomes Danny Hillier, Stefan Lindberg becomes Stephen Beaumont (Mont and Berg are French and Swedish words for mountain) and Charlotte Söringer becomes Charlotte Joubert.
The producers arranged for every member of Eurotunnel staff to receive a copy of the series on DVD as a thank you for their assistance in the making of the series. As well as some being extras, Eurotunnel staff gave up their time to advise the production team as well as more mundane tasks such as escorting the production teams and actors around what are secure sites.
Scenes filmed on board the train when the train appears to be traveling in tunnel were actually filmed while the train was stationary on one of the UK platforms. Windows were covered externally with remote controlled lights in them.
The Tunnel of the title runs between Cheriton - A suburb of Folkestone in Kent, England & Coquelles, near Calais, France. It makes landfall at Shakespeare Cliff, south of Dover and Sangatte, south of Calais.
In Series 1, Joseph Mawle's character is the brother of Keeley Hawes'character. Keeley's real life husband, actor Matthew Macfayden plays the protagonist to Joseph Mawle's antoganist in the series Ripper Street.
The Anglo-French adaptation of Bron/Broen (2011) was announced as a joint project between Sky and Canal+ in January 2013. Tunnel head writer Ben Richards worked with Hans Rosenfeldt, the creator of the original series.
Being a "50-50 co-production" between the British and French, the crew were a mix from both countries, and neither party had "final control". The series employed both British and French writers and directors to collaborate on the series, with former Spooks (2002) writer Ben Richards leading the writing team. Multiple versions of the script were used, which were translated for both languages.
In the United States, the first season aired on many PBS stations from June through August 2016. The second season was broadcast from June through August 2017. The third season aired July through August 2018.