Though many of the 33 Chilean miners have agreed to keep the details of the 69-day ordeal a secret, others have started to share their reflections and insights.
Sepulveda spent much of this weekend falling in love again with his wife, Katty, and dancing with his daughter, Scarlette. When ABC News came to visit, he read from the goodbye letter he'd written for his son, Franco, when he thought he was going to die.
"I will miss you, son," he wrote. "But I am tranquil and happy, because as I leave this earth, I know you will be in the good hands of your mother."
In his first TV interview since leaving the mine, Sepulveda, 40, said that he feared leaving his kids and wife alone.
"That was a familiar thought," he said. "But every time I thought of that, I immediately returned to where I was."
After being rescued, Sepulveda ran, yelling and cheering and hugging everyone in sight. The world media quickly nicknamed him "Super Mario."
He told ABC News that he admired President Sebastian Pinera for his efforts in rescuing "Los Treinta y Tres" -- those 33 men.
"I believed in our president," he said an hour after being released from the hospital. "He is forceful and he's rich. Nobody has given him what he has. He's a workaholic."
Sepulveda was so overwhelmed with emotion after he emerged from the mine that at first he didn't recognize Pinera. "I looked for everyone and then I realized I am in front of our president," Sepulveda said.
"It was so emotional to hug the president that I repeated it twice more because really our president played a fundamental role, and it was very humane of him to put in place the technology and resources to make the rescue possible."
To show his appreciation, Sepulveda handed out rocks -- souvenirs from the mine -- to workers and Pinera.
"I was thinking, 'How can I show my appreciation for the president and all of the people who did things for us?' ... Suddenly it occurred to me, 'Ah, yes. Rocks!'" he said.
After the cave-in, he said the miners set off some leftover explosives in the hope that someone on the surface would hear the noise. The blast loosened the rocks that he gave as gifts.
"Those gifts have a special sentiment that is personal and spiritual, that represent the 33 miners that were in there," Sepulveda said.
He said that on the day of the mine collapse, "I was wearing ear plugs and a hard hat, so I could barely hear."
"But I felt something odd and another miner started yelling, 'Mario, it's a cave-in.… Let's get out of here!'"
Sepulveda started looking desperately for a way out. He climbed a ladder up a ventilation shaft, but the ladder ran out, and rocks started showering down on him.
"I told the men, 'There's no escape. We need to remain in this shelter. God is here with us. Whoever wants to save themselves, take his hand,'" he said.
During those first few days, Sepulveda said, the men often screamed, fought and cried. "You have everything going through your mind: You fear, you cry and you suffer. You wonder, 'Is anyone coming to save us -- or not?' But doubt always was a passing moment, because we had faith. Every day at noon, we would pray. Every day. Down there, we were all … one religion."