The buzz around Dhanush's upcoming Tamil film, tentatively titled D55, has taken a decisive step forward. With legendary actor Mammootty officially coming on board, the makers have now announced that the film has commenced production. The launch was marked by a traditional pooja ceremony, signalling the beginning of what promises to be a high-profile and creatively ambitious project.A ceremonial start for a high-profile collaborationDirected by Rajkumar Periasamy, D55 features Sai Pallavi and Sreeleela as the female leads.