The Vortex Cage

Dual storyline following investigators who become trapped in a fortified and allegedly haunted laboratory from the 80s, and the original creators and researchers of the lab.  Both groups are plagued by phantom-like spirits that interfere with the time travel device that the original group attempted to create and that the investigators are trying to understand.  Ultimately it becomes apparent that the two groups are unintentionally doing battle with each other through temporal rifts that have spread throughout the building.