Tunnel Rats, also known as 1968 Tunnel Rats, is a 2008 German-Canadian war suspense film written and directed by Uwe Boll. The film is based on the factual duties of tunnel rats during the Vietnam War. In a documentary for the film, Boll revealed the film did not have a script, and instead the actors improvised their lines.The box office return was poor, but Tunnel Rats was met with positive reviews.