Toward the end, Blaine thought he wouldn't have been able to make it -- but he held strong, garnering his first record to be in the Guinness Book of World Records.
"I feel slightly emotional. I feel good about it, I feel happy," Blaine said. "It's a life-long dream, and I can't believe I did that."
Blaine says he was uncertain whether he would make it or not, fighting hard to stay underwater.
Blaine says his goal was to stay underwater for 23 minutes -- for his mother's birthday.
Oprah pressed Blaine on what his next challenge would be: Trying to stay awake longer than anyone ever has -- for 11 days straight.