radi saad told us, "i don't have any feelings. i have a goal.he most people in the least amount of time. but when i go home, i've spent nights crying, really crying." >> allahu akbar. >> [ speaking foreign language ]. >> reporter: day after day, building after building, hour after hour, victim after victim, how do you keep going? "there are a lot of people who need our help," he said. "there's a 50% chance in every operation that i'll live and a 50% chance that i'll die. but in the end i've left my mark. i've left children who are going to live and complete our future. radi saad calculates his odds at 50-50 because the white helmets themselves are targets of the assad regime. >> the plane doesn't attack once. it usually attacks twice or three times. so the civil defense are able to actually continue doing their work even understanding that that plane is waiting for people to gather up because it wants to come back and attack when there's a large crowd of people. >> reporter: the white helmets call that second bomb run, the one aimed at them, a d

rady saad told us, "i don't have any feelings, i have a goal.he most people in the least amount of time. but when i go home, i've spent nights crying, really crying." day after day, building after building, hour after hour, victim after victim, how do you keep going?" there are a lot of people who need our help," he said." there's a 50% chance in every operation that i'll live and 50% chance that i'll die. but in the end, i've left my mark. i've left children who are going to live and complete our future." rady saad calculates his odds at 50/50 because the white helmets themselves are targets of the assad regime. >> jarrah: the plane doesn't attack once. it usually attacks twice or three times. so, the civil defense are able to actually continue doing their work even understanding that that plane is waiting for people to gather up because it wants to come back and attack when there's a large crowd of people. >> pelley: the white helmets call that second bomb run, the one aimed at them, a double tap. and it happened during this rescue in aleppo.

majd khalaf and radi saad quit college to join the white helmets.ere was a woman and her husband," he told us. "only four of her fingers were sticking out of the rubble. we could see her moving her fingers like this." fingers, or here, the leg of a boy, are clues in a chaos of concrete. the leg led to hips and a torso. body parts are expected. but then they uncovered a face. more often than anyone could expect, life is resurrected from a shallow grave. as of tonight, 154 white helmet volunteers have been killed in the line of duty. our story, this sunday, on "60 minutes." we learned more today about the chattanooga school bus crash last month that killed six children. the driver is charged with vehicular homicide. police said he was speeding about 20 mph over the speed limit and had used his cell phone on the bus. they still don't know whether he was using it at the time of the crash. two children are still in the hospital. tonight there is a water emergency in corpus christie, texas. more than 300,000 residents are being warned not to use tap water

faces covered with dust and the eyes open, wha t rady saad told us, "i don't have any feelin gs, i me go home, i've spent victim after victim, how do you keep going?" there's a 50% chance in every chance that i'll die. i've left children who are going to live and complete our future."the white helmets themselves are targets of the assad regime. so, the civil defense e to actually continue doing their work even undeta that plane is waiting for people to gatup come back and attack when er >> pelley: the white helmetsm, . raed saleh wears the loss of his men and his country. the white helmets in more thanhd be of last week saleh has lost 154? "after several bombi said, "there were individual initiatiby carpenters, university students, doctors; people from different respond to emergencies in a more organized fashion.ter that, the" this is the training in a elite disaster teams from other nations teach the use of million for this, about a quarter of the white helmets' budget. this home was blasted into a the only thing escaping was one faint voice. a white helmet, searching, calls out, "br

. >> reporter: majd ka lav and radi saad quit college to join the white helmets. "there was a woman and her husband," he told us. "only four of her fingers were sticking out of the rubble. we could see her moving her fingers like this." fingers or here the leg of a boy are clues in a chaos of concrete. the leg led to hips and a torso. >> allahu akbar. >> allahu akbar! >> reporter: but then they uncovered a face. more often than anyone could expect, life is resurrected from a shallow grave. as of tonight, 154 white helmet volunteers have been killed in the line of duty. our story this sunday on "60 minutes." >>> we learned more today about the chattanooga school bus crash last month that killed six children. the driver is charged with vehicular homicide. police said he was speeding about 20 miles an hour over the speed limit and had used his cell phone on the bus. they still don't know whether he was using it at the time of the crash. two children are still hospital. >>> tonight there is a water emergency in corpus christi, texas. more than 300,000 residents are be