The Agonizer (2018)

Two friends, Aubrey and Josh, try and decide what they should do with their day. Aubrey tells the story of "Camp Greenlake", an abandoned military base which once held inhumane experiments on test soldiers. As stories told, one day as the scientists were performing tests, something went wrong and the subject was freed, slaying everyone in the room before breaking free, never to be seen again. The two decide to head for the grounds for some curious investigating, only to find more than they had ever hoped for.