I loved this movie (and, surprisingly, so did my girlfriend, who I took to see it)
. After watching it for a first time, I read that, during
the last scene, there is what appears to be a comet falling into the ocean. People are speculating that this is the monster coming to earth. Actually,
people are even pondering that this could be a satellite that belonged to the company that the main character worked for. I don't know how one would
know this, though (unless it was part of an ARG). Supposedly, this satellite is what woke up the monster. All I know is that I saw the comet/satellite
in the final scene on my second viewing of the movie (I went with my girlfriend and her family this time). Also, supposedly, at the very end of the
movie (after the credits) there is a reverse audio that, when played normally, says "it's still alive"