The Tunnel (2011 film)

The Tunnel is a 2011 Australian horror film directed by Carlo Ledesma, and cowritten, coproduced and coedited by Julian Harvey and Enzo Tedeschi. The film stars Bel Deli, Andy Rodoreda, Steve Davis, Luke Arnold, Goran D. Kleut and James Caitlin, in a documentarystyle horror story set in the underground network of abandoned railway tunnels in Sydney, Australia.

They come upon a huge underground lake and while filming, Tangles hears strange noises through the audio headphones. However, he takes it as a joke and the group heads to the room where the WWII air raid bell is. To get footage of the bell ringing, Natasha hits on it but Tangles says it is distorting the audio. He decides to take the boommike into an adjoining room to reduce the sound levels, leaving Peter with the headphones to listen for distortion in the bell volume. Natasha hits it again and Peter hears something very disturbing in the headphones. Tangles audio cable is suddenly pulled through the opening, snapping and disappearing. The rest of the crew panics and goes to look for Tangles.The scene switches to the interview, where Natasha is allowed to hear this recording for the first time. As the sound of the bell plays, screams of agony can be clearly heard before the headphone wire snaps. Upon going back to the bell room, the crew finds that all their equipment is gone. While searching for Tangles, they find a room blocked off by corrugated metal. Natasha places down the camera to help Peter and Steve. They get into the room and are horrified to find blood everywhere and Tangles abandoned torch. At the entrance of the room, Natasha picks up the camera, seeing that it was not where she had left it, so they review the footage and a glimpse of whatever it was that had picked the camera up is seen. Someone is apparently stalking them. ........

Source: Wikipedia