Filmmaker Anubhav Sinha feels that the cast and crew of his new film "Warning" would need patience and courage to shoot water sequences.

"Loads of love, patience and courage to the cast of #WARNING. They will spend next four weeks in water everyday 12 hrs a day, " Sinha tweeted.

Directed by debutant Gurmmeet Singh, the 3D horror flick, revolves around a group of friends. The entire crew from the cameraman to other technicians has been hired from abroad.