A US television show has carried out a series of tests that show DiCaprio's character could have survived the disaster had Rose removed her life jacket and put it under the raft, reported Daily Mail.
The Discovery Channel's 'Mythbusters' recreated the treacherous conditions after the Titanic sank in 1912 and, through hypothermia tests, discovered Jack would have survived the freezing conditions if he had climbed out.
In the 1997 film, Jack remains in the freezing water while Rose lies on top of a floating piece of the wreckage as he does not want to topple it.
In the dramatic climax to the Oscar-winning epic, Jack dies from hypothermia while Rose is rescued.
'Titanic' director James Cameron told 'Mythbusters' he believed the wooden life raft would not have supported both Jack and Rose.
But the team found that if Rose had taken off her lifejacket and put it under the raft it would have given them enough buoyancy to keep both of them afloat.
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Cameron, however, had the last word telling the TV show that Jack had to die as that's what the script called for.
"I think you guys are missing the point here. The script says Jack died. He has to die. So maybe we screwed up and the board should have been a little tiny bit smaller, but the dude's goin' down."