June, 1944: a group of demoralised, battle-weary German soldiers take shelter at a bunker in the Ardennes Forest. Low on ammunition, they decide to retreat from the advancing American forces through a system of underground tunnels. But there's a problem: these subterranean corridors were built on the site of a medieval plague pit. Which means, naturally, they're rumoured t൲o be haunted.

Opening, somewhat pretentiously, with Nietzsche's famous quote about gazing into the abyss, this British horror film attempts to unsettle through suggestion and inf🌠erence rather than explicit gore. An admirable intention, for sure, but while the explanation for the men's ghostly visions remains pleasingly ambiguous throughout, any good wor⛦k is undone by the distractingly motley English accents and the formulaic characterisations (Jason Flemyng's reluctant hero, Andrew Tiernan's pill-popping Nazi, John Carlisle's spooked old-timer). Director Rob Green, meanwhile, proves unable to sustain tension amid all the shouting, running and shooting.