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"titanic" director james cameron turned to the "mythbusters" for help. >> thousands of fans think i got it wrong, could have both been supported by the board and could have lived. >> reporter: the "mythbusters" tried it first in a bathtub with little jack and rose dolls. >> it doesnt look like they could stay afloat. >> reporter: then tried it for real in the open water. >> jacks first attempts to get aboard the board seem very similar to the movie. the board does appear to be made for one. sure...