OUT OF THE WATER. HE WAS BITTEN SO BADLY HIS LEG HAD TO BE AMPUTATED. >> Reporter: TERRIFYING FOOTAGE SHOWS THE SECOND AFTER A 20-YEAR-OLD GOT ATTACKED BY A SHARK. IT ENDED WITH HIS LOSING A LEG BELOW HIS KNEE. YOU CAN HEAR THE PANIC IN HIS VOICE AND THAT OF HIS FRIEND WHO SAVED HIS LIFE PULLING HIM OUT TO SHORE. THE ITALIAN STUDENT RECORDED THAT FOOTAGE BECAUSE HE WANTED TO SAY GOODBYE. IT HAPPENED ON FRIDAY ON A BEACH IN QUEENSLAND IN NORTH EASTERN AUSTRALIA. HE WAS THERE TO WORK AND STUDY. HE TOLD A NEWSPAPER FROM HIS HOME STATE THAT HE TRIED TO OPEN THE SHARK'S MOUTH EVEN THOUGH HE KNEW HIS LEG BELOW THE KNEE WAS GOING. SOMEONE ELSE SHARING THIS VIDEO OF THE AREA WHERE THE SHARK ATTACKED MARIOTTI. WRITING THE WATER IS FULL OF FISH AND SHARKS. YOU CAN SEE SOME OF THE FINS THERE IN THE WATER. UNPROVOKED SHARK ATTACKS GAINING INTERNATIONAL ATTENTION OVER THE LAST WEEK FOLLOWING TWO PEOPLE DYING IN THE RARE ENCOUNTERS. FOR THE MOST PART, SHARK ATTACKS HAVE NOT GONE UP SIGNIFICANTLY IN RECENT YEARS THAT SHARK BEHAVIOR COULD BE CHANGING DUE TO CLIMATE CHANGE MAKING OCEANS WARMER WHICH CAUSES ANIMALS TO MOVE. SOMETIMES THAT INCLUDES PLACES WHERE THERE ARE A LOT MORE PEOPLE. >> THERE BEEN MESSAGES OF SUPPORT FROM ALL OVER THE WORLD INCLUDING FROM AN AMPUTEE,