The procedure involved cutting into his chest and removing his heart to repair the holes, leaving behind a huge scar.
Remarkably, after just six weeks of recovery, the British teen, his mom, Gemma and dad, Gary, climbed the Snowdon Mountain, which at 1,085 metres, is the highest mountain in Wales.
The teen said the climb was in honour of those who looked after him, as well as to raise funds for the Alder Hey Children's Charity which helped him raise the money he needed for his lifesaving surgery.
The Alder Hey Children's Charity received £ 7000 (more than R135 000) in donations thanks to the teen's climb.
Watch the video above for more.
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