So 150 remain out of 5000 who returned from captivity, plus an approximate 25,000 who were flown out of the pocket after encirclement, plus an unknown number who were there between August and November 19th 1942 (prior to encirclement)...
I would have thought it would be more than 150. Their knowledge of what happened at Stalingrad is invaluable. I hope they are telling their stories!