Alex Pettyfer has Superman Henry Cavill to thank for ‘saving his life’ when he ‘nearly drowned’ while filming for their new movie, The Ministry of Ungentlemanly Warfare. The celebrity explained Cavill “saved me from falling off a boat” when they were on set filming. What could have become a tragedy in Hollywood saw the actor stepping in to save his co-star. The movie star said he was “very grateful” to be on the film with him – probably in more ways than one! Alex Pettyfer ‘saved from drowning’ by Henry CavillThe 33-year-old told Entertainment tonight: “He saved me from falling off a boat. “I …