Close Encounters of the Giant Kind

In this video, posted by NationalGeographic, a huge Right Whale gets a little too close for comfort to the diver featured in the video, giving him a good scare (though the right whale didn't seem to mean the diver any harm). By the way, when I went to Alaska last summer, I remember hearing about some of the whales feeding close to where the whale watching boats were too and some of them got a little too close for comfort there too (note: I wasn't on that excursion, but those were the rumors I heard). By the way, what would you do if you were in this man's situation?