The Three men's lives were saved as they were held above water by the monster which they discover to be a modern submarine, named the Nautilus, as they climb inside they come upon the submarines captain and his crew, his name is Captain Nemo (as i recall).
"Bob used discretion when speaking to the movie star eating in the diner."
Students would be the subject because they are the ones doing the action. Questions is the direct object, and Elsa is the indirect object