Question: will there be a fourth series of the tunnel

Answer: No, The renewal for a third and final series was announced on 20 January 2017 entitled The Tunnel: Vengeance and consisting of six episodes. It began filming in March 2017 and premiered on Sky Atlantic on 14 December 2017, with all episodes released on the same day. Canal+ did not announce a corresponding date for France at the time of the UK release. Season 3 premiered on Canal+ on 4 June 2018.