The Cruciform Key

The cruciform key is the MacGuffin of this movie. It's a two-piece key that sinks together with what are called dragon eggs in the movie to indicate that these are, in fact, the two pieces that deserve each other. The end opens the movie at the bottom of the ocean as well. Do you think Ethan Hunt is going to die in part two? I haven't thought that hard about it. Tom Cruise is going to like smash Kate Winslet's record for the longest underwater action sequence in part two.