Watch The Tunnel Online free at Couchtuner. ed by Scandinavian drama The Bridge, The Tunnel is set against the backdrop of Europe in crisis. When a prominent French politician is found dead on the border between the UK and France, detectives Karl Roebuck and Elise Wassermann are sent to investigate on behalf of their respective countries. However, the case takes a surreal turn when a shocking discovery is made at the crime scene, forcing the French and British police into an uneasy partnership. (Source: Sky Atlantic)