THIS WEEK ON '20/20: IN AN INSTANT' AFTER A WOMAN DRAMATICALLY FALLS 60 FEET FROM A CANYON WALL, HER BELOVED DOG PROVES TO BE HER ONLY CHANCE OF SURVIVAL

Returning for its second season, "In an Instant" does more than just re-tell heart-pounding first-person accounts of the world's most harrowing tales of survival; it brings them to life with breathtaking dramatizations of the moments before and after life was forever changed. The powerful series features the trials and triumphs from every angle, and includes gripping first person interviews with the people who lived to tell their stories - and those who were instrumental in helping rescue everyone they could. What key decisions did they make to save their lives? "20/20: In an Instant" continues on SATURDAY, AUGUST 13 (9:00-10:00 p.m. EDT), on the ABC Television Network. (Rebroadcast. ABC OAD: 07/02/2016)

Episode 3: "Desert Dog Rescue"

Marathoner Danelle Ballengee was on a training run with her dog, Taz, just outside of Moab, Utah, when she slid on some rocks and fell 60 feet off a canyon wall, landing on her feet and shattering her pelvis.

Deep in the canyon with no one to hear her cries, Ballengee managed to drag herself with just her arms for five hours over a quarter of a mile. Temperatures were dropping, her hands were getting frostbitten and she was in shock, but Taz was there to boost her spirts and to keep her warm.

After more than two days in the canyon, she'd all but given up hope - alternating between saving her strength and trying to crawl just a little bit further - even doing crunches to stay warm, despite her crushed bones. Taz started making trips farther away from Danelle, who is convinced he was looking for someone to help save her. She'd later learn that he was the remarkable key to her survival.

"20/20: In an Instant" is executive-produced by Maria Awes and Andy Awes for Committee Films in association with ABC's Lincoln Square Productions. Rudy Bednar is executive producer on behalf of Lincoln Square Productions.