After accepting a ride from a stranger, a woman named Lisa wakes up trapped in a claustrophobic maze of interconnected, high-tech tunnels filled with lethal obstacles. With a countdown timer strapped to her arm, she is forced to crawl and maneuver through the series of chambers to survive. As the traps become increasingly complex and perilous, Lisa must rely on her resourcefulness to navigate the environment and uncover the true nature of her imprisonment.