Stag Night (2008)

Four men out on a STAG NIGHT in New York prematurely exit an underground train after the soon-to-be-best-man begins to hassle two women. Trapped at a deserted station these six adults become the target of a gruesome manhunt when a secret gang of cannibal dwellers, living in the tunnels discovers them. Tensions will rise as they fight to make it through the night with all their limbs attached.