I can't believe that I hadn't ever seen this before, and I am glad that Cameron got to make a riff on Close Encounters, in a film that notably contains more whimsy than anything else he has made. I enjoyed how scifi elements just on the fringe of believability, like mobile oil drilling platforms and breathable water, are subtle includes crucial to the plot. It's nice to see that the seeds of Avatar and, of course, Titanic are obvious here…