Protagonist Pictures (Firm) (Corporate Name)

Submarine [VR], 2011: (in association with Protagonist Pictures)

Internet Movie Database, Oct. 17, 2011 (Protagonist Pictures [gb], production company)

Company website, Oct. 17, 2011 (Protagonist Pictures, located in London, an international sales and financing company with relationships with filmmakers, investors and distributors)

Company Data Rex website, Oct. 18, 2011 (PROTAGONIST PICTURES LIMITED ; LONDON ; incorporated Nov. 13, 2007)