The Abandon description:

After an intense firefight in Iraq, wounded American Sergeant Miles Willis awakens alone in a strange empty room with no windows or exits. Nothing makes sense. Writing appears on the walls, the temperature fluctuates, and gravity randomly shifts. He's able to communicate with just one person - a mystery woman who calls him on his sat phone, claiming to be trapped in a similar space. Before the clock runs out, the two of them must figure out who has them, why they were taken, and how to escape.