Filmmaker Anubhav Sinha unveiled the trailer of his new film Warning.
Based on a true story, a huge portion of the film has been shot underwater, and he admits it was indeed difficult for the team.
"The actors had to stay in the water (almost) all the time. It was not easy for them as well," he said.
Warning is a 3D horror film and stars Santosh Barmola, Suzana Rodrigues, Varun Sharma, Manjari Phadnis, Jitin Gulati, Sumit Suri and Madhurima Tuli. It will release on September 27.