RESPONDING OFFICERS WHO RETURNED FIRE AND LATER TOOK HIM INTO CUSTODY. IT. LORI: JOSEPH MINGHELLA ALSO KNOWN AS THE ANGEL OF DEATH, WAS A NOTORIOUS AUSSIE DOCTOR WHO CONDUCTED MEDICAL EXPERIMENTS ON PRISONERS DURING THE HOLOCAUST. STEVE: DEVASTATING DETAIL TWIN BROTHERS DESCRIBED THINK SERMONS PERFORMED ON THEM BY THE TEAM AND AS DANA TELLS US THE BROTHERS WANT TO MAKE SURE THAT THE WORLD IT NEVER FORGETS. >> HE DIDN'T SAY BECOMING CAN BE FOR HIMSELF RATED. REPORTER: EMOTIONS RAW AND THEY ARE STILL VIVID AND MORE THAN 75 YEARS AFTER PETER SURVIVED THE HOLOCAUST. THE 88 -YEAR-OLD WHO IS NOW LIVING HERE IN WESTCHESTER, NEW YORK WAS ONLY 11 WHEN HE ARRIVED AT THE CONCENTRATION CAMP IN JULY OF 1944. THE INK IS STILL VISIBLE FROM HIS PRISONER NUMBER, 817454, THAT WAS TATTOOED ON HIS ARM AND ARRIVAL AND THAT IS ALSO WHEN HE CAME FACE-TO-FACE WITH NOTORIOUS NOT A DOCTOR, JOSEPH MINGHELLA. >> HE CAME AROUND IN THE PAST ABOUT MY MOTHER FIRST. AND THEN THIRD TIME SHE SAID YES AND IMMEDIATELY TO AN AND GENTLEMEN GRABBED US AND NEVER EVEN HAD A CHANCE TO SAY GOODBYE. REPORTER: PETER AND HIS TWIN BROTHER THOMAS WITH HER 13 -YEAR-OLD SISTER ALICE, AND MOTHER ELIZABETH, HAD ALL UNKNOWINGLY BEEN IN LINE FOR THE GAS CHAMBERS WHEN THE TWINS WERE PLUCKED DECIDED BRADY AND THE NEVER SAW ALICE FOR ELIZABETH AGAIN. >> THE MOMENT THAT WE GOT INTO THE BARRICADE, THE MAN WHO IS IN CHARGE, WE ASK HIM WHEN CAN I SEE MY MOTHER. THAT WAS THE FIRST QUESTION. AND THEY SAID FLAMES AND THAT I WILL NEVER SEE MY MOTHER AGAIN . REPORTER: JOSEPH WAS YOUNG, CHARMING AND OUTWARDLY PLEASANT AND A FAĆADE THE MASK UNSPEAKABLE EVIL AND HE WAS KNOWN AS THE ANGEL OF DEATH, OFTEN PERSONALLY ADMINISTERING THE HYDROGEN CYANIDE GAS TO HIS VICTIMS. MORE THAN A MILLION INNOCENT MEN WOMEN AND CHILDREN WERE MURDERED IN AUSCHWITZ ALONE AND MAKE THEM A ALSO CONDUCTED MEDICAL EXPERIMENTS ON PRISONERS AND HAD A FASCINATION WITH TWINS PREDICT. >> I THINK HIS AIM WAS TO FIND SOME KIND OF AN ALGORITHM OR SOMETHING TO HELP GERMAN MOTHERS TO CONCEIVE AND TO BEAR TWINS OR TRIPLETS OR WHATEVER TO INCREASE THE GERMAN POPULATION. REPORTER: TO RESUME WE SPOKE WITH PETER TWIN, THOMAS WHO CHANGED HIS LAST NAME AND NOW LIVES IN TORONTO AND HE AND PETER WERE SO YOUNG WHEN THEY MET MINGLE AND HIS COHORTS AND NEVER REALLY UNDERSTANDING WHAT WAS BEING DONE TO THEM PREDICT THEY REMEMBERED IT DOCTORS DRAWING BLOOD FROM THEIR ARMS IN MEASURING THEIR HEADS. >> ONE THAT I RECALL VIVIDLY WHICH WAS THE MOST UNPLEASANT WAS TAKING AN IMPRESSION ON MY TEETH. BASICALLY, SOMEBODY PACKED WHAT I FIGURED IT MUST'VE BEEN JACKSON, CALCIUM SULFATE IN MY MOUTH AND I HAD TO KEEP MY MOUTH OPEN AND IT WAS VERY UNPLEASANT AND I WAS LIKE, WAS CHOKING AND GAG REFLEX PREDICT AND LUCKILY, IT WAS NOT A BRUTAL EXPERIMENTS FILM BEFORE BECAUSE WE WERE VERY LASTED JUST ABOUT THE LAST SURVIVORS. REPORTER: THEY ARRIVED ABOUT SIX MONTHS BEFORE THE CAMP'S LIBERATION. THEY WERE PART OF A MASSIVE GROUP OF MORE THAN 400,000 JEWS PACKED INTO CATTLE CARS AND IMPORTED FROM HUNGARY AND JUST 54 DAYS PREDICT AND A LOT OF CHILDREN AND A LOT OF 11 -YEAR-OLDS AND YOUNGER, THEY WERE KILLED RIGHT AWAY BECAUSE THEY WERE NOT STRONG ENOUGH TO WORK. DO YOU THINK YOU ACTUALLY BEING A TWIN IS WHY YOU SURVIVED. >> OH NO DOUBT ABOUT IT. I MEAN,, IT IS ABSOLUTELY CERTAIN. THERE IS JUST NO TWO WAYS ABOUT IT. I WOULD NOT BE HERE OR ALIVE TODAY IF I HAD NOT BEEN A TWIN . >> ONE DAY, WHEN ANOTHER OFFICER CAME AROUND THE AND THE SECOND SELECTION AND SAID TO US AGAIN. FROM THE GAS CHAMBER. THEY WERE TAKEN INTO ANOTHER ROOM, AND WERE READY FOR THE G GAS. IN A TRUCK TOOK US TO THE GAS CHAMBER EXCEPT SOMEHOW RATHER, THEY SAID NO, I WILL DECIDE. AND NOT ANOTHER OFFICER IN THE OFFICER APPARENTLY ANGERED HIM AND HE WAS SENT TO RUSSIA. >> MANDALA IS THE REASON THE BOYS ARE ALIVE . DID A DARK IRONY IN A LIBERATION THOMAS AND PETER MAKE THEIR WAY TO ISRAEL BEEN IN LONDON AND IN CANADA WERE THOMAS STATED PETER EVENTUALLY LEFT FOR NEW YORK WITH HIS LIFE ENTERED WIFE ANA AND HER FAMILY ALSO SURVIVED THE HOLOCAUST BY HIDING IN DIFFERENT LOCATIONS THROUGHOUT BUDAPEST, PREDICT BETWEEN BROTHERS WORKED HARD IN THE NEW LIVES AND RAISED BEAUTIFUL FAMILIES AND THEIR FATHER JOSEPH, SURVIVED IT THE CONCENTRATION CAMP AND LIVE TO 5 YEARS OLD. PETER AND THOMAS, ANOTHER STORY IS UNIQUE AND DESPITE HOW PAINFUL IT IS TO TELL, THEY UNDERSTAND THE IMPORTANCE OF DOING SO. >> IN ABOUT TEN - 15 YEARS, THERE WOULD BE NO SURVIVORS ALIVE. EXCEPT THE EYEWITNESSES . >> AS FAR AS I'M CONCERNED, IT WAS THE CRIME IN HUMAN HISTORY. AND MUST NOT BE FORGOTTEN. REPORTER: PLEA TO FUTURE GENERATIONS, TO NEVER FORGET. "FOX 5 NEWS". STEVE: THAT'S DIFFICULT TO COMPREHEND