I thought the same thing Richard, but now that you clarified it I see that the video you linked to starts at 38 seconds into the effect. I didn't notice at first viewing. Here it is from the beginning:
Joe Naud wrote:... and the two year wait this year was too long.
AJM wrote:i'm planning to watch titanic at the weekend - everyone, please don't spoil it for me by telling me how it ends.