Would make a great HORROR movie
read the complete stryline and thell me this wouldnt make a great horror movie. Lost city of Z and it could be about them looking for eldorado and nobody ever returned after leaving and looking for the city; and when they find it would be the lost city of zombies. If done right it would look very well. maybe done in the same way as from dusk til dawn. you dont see any actual zombies until like 45 min into the movie. that way you can get to know the characters a little more. only with a better budget dont use cgi unless actually needed. maybe james wan or Ridley Scott.