Trench 11 (2017)

Trench 11 (2017): written by Matt Booi and Leo Scherman; directed by Leo Scherman; starring Rossif Sutherland (Canadian Lieutenant Berton), Robert Stadlober (Reiner), Charlie Carrick (Doctor), Shaun Benson (German Kapitan Muller), Ted Atherton (British Major Jennings), and Luke Humphrey (U.S. Captain Cooper):

Enjoyable low-budget Canadian horror movie filmed in Manitoba and Ontario. Rossif Sutherland is an appealing Everyman as a Canadian 'tunneler' in WWI. He's supposed to be on leave as the war enters its last days. But British Military Intelligence needs him to help a small group investigate a mysterious underground German complex in the Ardennes.

Well, and we all know how respectful British intelligence officers are of human life, allied or otherwise. Because the Ardennes are under American control, the squad consists of four American infantry, two British officers, and our Canadian tunneler.

It's no surprise to discover that the Germans were developing a new weapon before something happened and they sealed the complex, badly. Once the squad enters the complex, things rapidly go sideways. 

Trench 11 becomes something of a surprise at this point, focusing on humanity's capacity for monstrosity rather than on some pitched battle against super-zombies. The film-makers do a nice job of conveying the claustrophobia and confusion going on far below the surface of the Earth. It's a terse and effective film. Recommended.