A teenager who was declared dead started moving when his heartbroken family were saying goodbye to him.
Sammy Berko, 16, from Texas, US, had just scaled a rock climbing wall at his local gymnasium after reaching the top of the summit.
But just moments later he suddenly became unresponsive and his body limp.
His parents thought he was messing around but instead he was having a major cardiac arrest.
Sammy’s mum Jennifer told Fox 26: “He climbed to the top of the wall, rang the bell, as we were told, and then his body went limp, and it looked like he was either playing around or passed out.
"They weren’t quite sure and when they realized he was unresponsive, they lowered him slowly."
Paramedics, doctors and bystanders rushed to give the teen CPR for two hours but he was tragically pronounced dead.
The heartbroken parents were given a private moment to say goodbye to their beloved son - having already lost his sibling Frankie three years ago.
Jennifer said: “I started talking to him, just telling him how much I love him and sorry that we didn’t know how to save him. Suddenly, as I started praying, my husband said, ‘Oh my gosh, he’s moving."
The parents were left stunned as their child started to show signs of life - with medics calling it a "literal miracle".
Jennifer added: “These are professionals who have been doing this their entire lives, who have seen the worst of the worst.
"Each and every one of them afterward came to us and said that they have never seen anything like this before. Ever.
"Never had they ever pronounced somebody and suddenly they came back five minutes later.”
Fortunately, Sammy only suffered limited injuries despite the lack of oxygen to his brain.
He had short-term memory loss, which only lasted a couple of weeks, but the lucky teen doesn't remember much else.
Sammy said: "I don’t remember anything about the day it happened.
"The last thing I remember is the night before we had to sign waivers online (for the rock climbing gym), and then I woke up … Then I remember my dad telling me, ‘This is what happened and you better remember this time', because he said it so many times."
After doing multiple tests, the family learned they had been living with a rare genetic disorder that affects the heart called Catecholaminergic polymorphic ventricular tachycardia (CPVT).
Mum Jennifer and Sammy both underwent surgery - with the three of them given medication to prevent cardiac arrest.
The teenager suffered a spine injury during his cardiac arrest and has lost the ability to move his legs.
However, he is learning to walk again and is undergoing multiple forms of therapy at TIRR Memorial in Houston to help build up his strength.
Sammy said: “I knew it would be a weird, crazy experience learning to walk again and working on strength without using my legs to be able to balance me. It has just been an amazing experience here actually, like I’ve noticed that I’m better every day! I’m doing something new every single day."
