>>> NOW TO A "GMA" FIRST LOOK AT NATIONAL GEOGRAPHIC'S NEW SPECIAL "TITANIC: 25 YEARS LATER WITH JAMES CAMERON" UNRAVELING THE MYSTERIES AND BLOWING THE DOOR DEBATE WIDE OPEN, GUYS. WAS THERE ROOM FOR JACK TOO? LET'S FIND OUT. IT'S THE MUCH DISCUSSED MOVIE ENDING FANS WILL NEVER LET GO. >> I'LL NEVER LET GO. >> Reporter: COULD JACK HAVE SUR I HAVE HAVED THE SINKING OF THE "TITANIC" IF HE CLIMBED ON THAT FLOATS PIECE OF DEBRIS WITH ROSE? A THEORIES THAT'S BEEN TESTED BEFORE BUT NEVER BY JAMES CAMERON HIMSELF UNTIL NOW. >> WE'LL FIND OUT ONCE AND FOR ALL WHETHER JACK COULD HAVE SURVIVED THE SINKING OF "TITANIC." >> Reporter: IT'S PART OF THE NEW SPECIAL "TITANIC: 25 YEARS LATER WITH JAMES CAMERON." HE AND A TEAM OF SCIENTISTS TOOK TWO STUNT PEOPLE AND TESTED FOUR DIFFERENT SCENARIOS TO SEE IF THE TWO COULD HAVE SHARED THAT BOARD. >> JACK AND ROSE ARE ABLE TO GET ON THE RAFT BUT NOW THEY'RE BOTH SUBMERGED IN DANGEROUS LEVELS OF FREEZING WATER. >> Reporter: THE CONSENSUS JACK LIKELY WOULDN'T SURVIVE. THEN THEY FIND A POSITION WHERE BOTH OF THEIR UPPER BODIES ARE OUT OF THE WATER. >> OUT OF THE WATER WITH VIOLENT SHAKE WAS HELPING HIM AND JOE CORRECTING IT OUT HE COULD HAVE MADE IT PRETTY LONG, LIKE HOURS. >> Reporter: BUT THEY'RE NOT EXHAUSTED LIKE IN THE FILM SO FOR THE FINAL TEST, THEY FACTOR IN THE PHYSICAL STRAIN THE CHARACTERS ENDURED LEADING UP TO THIS POINT. >> JACK. >> ROSE. >> JACK SWIMS OVER. >> JACK. >> AND, ONE, TWO, THREE. >> Reporter: AND THIS TIME ROSE OFFERS THE LIFE JACKET TO HELP INSULATE HER MAN. >> AND HE'S STABILIZED. SHE GOT HIM TO A PLACE WHERE IF WE PROJECTED THAT OUT HE JUST MIGHT HAVE MADE IT UNTIL THE LIFE BOAT GOT THERE. >> Reporter: CAMERON'S VERDICT. >> JACK MIGHT HAVE LIVED BUT THERE'S A LOT OF VARIABLES. I THINK HIS THOUGHT POSSESS WAS I'M NOT GOING TO DO ONE THING THAT JEOPARDIZES HER. AND THAT'S 100% IN CHARACTER. >> SO NO DEFINE TIFF ANSWER AFTER ALL THAT AND THAT'S JUST THE TIP OF THE ICEBERG, BA-DUM-DUM. YOU GET IT? SEE "TITANIC:25 YEARS LATER"