The Bioscopist has an interesting article which sheds some light on what David says to the Engineer at the of Prometheus.
Beware this obviously contains spoilers.
According to the site:
The clue lies in an earlier scene where David learns about linguistics, while the rest of the crew are in stasis.
The ‘Professor’ in the clip is in fact the real-life linguistics consultant used for the film and taught Michael Fassbender (David) the dialogue. I managed to track down the consultant, a Dr. Anil Biltoo of the SOAS Language Centre in London, to see if he could shed some light on the mysterious final scene.
And as for what he said? Spoilers ahoy!
The line that David speaks to the Engineer [which is from a longer sequence that didn't make the final edit] is as follows:
“ida hman?m a? kja nam?tuh zd?:taha … gh??vah-pjorn-?ttham sas da:t? kredah”
A serviceable translation into English is:
“This man is here because he does not want to die. He believes you can give him more life.”
So there you are! Hopefully we’ll see the full version of the scene – perhaps with subtitles? – in an extended cut of the movie.
Thanks to seeasea for the heads up.
Prometheus is directed by Ridley Scott, from a screenplay by Damon Lindelof and Jon Spaihts. The film stars Noomi Rapace, Michael Fassbender, Charlize Theron, Guy Pearce, Idris Elba, Sean Harris, Rafe Spall, Logan Marshall-Green, Patrick Wilson and Kate Dickie, and is now on release around the world.