Movie - Hereafter

Last night Jane and I attended a prerelease screening at Muvico of Hereafter. I liked it for the superb acting and even more for Clint Eastwood's directing. I went in skeptical about what was inevitably the hokey subject of a psychic communicating with the dead. Yet, it was engaging and entertaining. I seem to be inexplicably prejudiced against Matt Damon but, surprisingly, I even liked Matt -- maybe because he didn't have a very demanding role. I won't call it a "must see" but I think most people would enjoy this movie. If you see it, tell me how they filmed the extremely impressive tsunami near the beginning.