When surgeons began operating on Houston Astros first-base coach Rich Dauer for an acute subdural hematoma just after the team's World Series championship parade in November, doctors told Dauer's wife and friends that he had just a 3 percent chance of survival, he confirmed to ABC's Good Morning America.

The Athletic detailed the rush to save Dauer, 65, and his unlikely rapid recovery after he slipped on a wet floor and hit the side of his head on Nov. 2, the night before he rode in the parade through downtown Houston.

"I hit the right side of my head, but I didn't feel any pain and I wasn't hurting," Dauer told Good Morning America in an interview broadcast Thursday. "So I got up the next day and went to the parade."

During a rally at City Hall following the parade, Dauer began to stagger, and according to The Athletic, he told assistant hitting coach Alonzo Powell, "I don't really feel too good."

After falling ill during a City Hall rally celebrating the Astros' World Series championship, first-base coach Rich Dauer was given a 3 percent chance of survival, according to a report from The Athletic. Leslie Plaza Johnson/Icon Sportswire

Many members of the organization told The Athletic that, at the time, they simply thought Dauer, who had already decided to retire, was suffering from dehydration. Soon, though, EMTs were carrying him from the stage on a stretcher and placing it on the back of a golf cart to reach the nearest ambulance, which was three blocks away. After a lengthy delay due to traffic, Dauer was taken to Houston Methodist.

Dauer was in respiratory arrest at the hospital and required a breathing tube. Dr. James Muntz, a team physician who specializes in internal bleeding, told The Athletic, "He was unresponsive, just a disaster."

"I was scared. And I just prayed," Dauer's wife Chris told Good Morning America. "I just said 'Lord, don't take my husband.'"

According to The Athletic, a CT scan showed the presence of blood on Dauer's brain -- a problem made worse by the fact that he was on a blood thinner due to a heart condition.

Neurosurgeon Dr. David Cech told The Athletic that when he began the approximately three-hour surgery, Dauer was in a coma, "almost brain dead."

"I called my three daughters and I said, 'You need to come to Houston because your dad ... it doesn't look good,'" Chris Dauer told Good Morning America.

In addition to removing the blood that was around Dauer's brain, Cech and his team stopped the bleeding and relieved pressure on Dauer's brain stem by pushing his brain back toward the right side after it had shifted about a centimeter to the left.

After the surgery, Cech told Chris Dauer that he wouldn't know the extent of any brain damage until her husband woke up. Cech said that he also told Chris Dauer he was cautiously optimistic because the surgery had gone well.

Dauer's breathing tube was removed after just three days, which shocked Dr. David Lintner, the Astros' head physician.

"The magnitude of what he had wrong was intimidating, astonishing," Lintner said. "The pace of his recovery was just as astonishing."

Dauer said he's had no side effects since leaving the hospital on Nov. 15, with his stay extended due to fluid in his lungs. He has resumed working out and will undergo periodic checkups but said his brain is "perfectly fine."

"I don't have any pain," Dauer told Good Morning America. "I do not feel confused. I don't have any balance issues."

Said his wife: "He's a miracle. He's a walking miracle."