
On 26 December 2004, a huge earthquake occurred under the Indian Ocean, triggering the devastating Boxing Day Tsunami.
It killed an estimate of over 228,000 people, including many tourists on the beaches of Thailand.
With buildings and villages completely destroyed there are countless survivor accounts of the tragedy with one of the most famous being that of supermodel Petra Němcová, who clung onto a tree for dear life to escape the destruction.
It was one of the deadliest natural disasters ever recorded and inspired the hugely famous film The Impossible (which is on UK telly this Sunday, 2 August, 10.3pm on BBC One) that was based on a real family’s experience.
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Petra has spoken about her own experience over the years and the influence it had on the rest of her life, having lost her then fiancé, Simon Atlee, in the tsunami.
The couple were on holiday in Thailand when the quake caused a tidal wave to consume their bungalow in Khao Lak.

Petra’s experience
When the wave of rolling black water consumed the bungalow she and Atlee were staying in, the Czech model’s pelvis was shattered in four places.
"Everything happened in split seconds. I looked up to see frantic movement and people jumping and then in the next second, the wave is crashing into the bungalow and breaking all of the glass windows," she recalled to PEOPLE.
As the bungalow went under, shards of glass sliced her skin.
"I heard Simon screaming my name," Petra said, "and it was the last time I heard him."
With the pair swept up in the water, his body wasn’t recovered until months later.
"At some point I couldn't breathe anymore. And I thought, 'That's it.' That's my last moment. And I let go. And actually, it was the most blissful moment of my life," she recalled, describing how she'd made peace with dying.
"And then, by some miracle, I was able to see sky again."
Despite being naked and suffering from her shattered pelvis and multiple internal injuries, somehow the model ended up managing to grab onto a palm tree, clinging on for ‘an incredibly long eight hours’.
Appearing on Good Morning America on the 20th anniversary of the disaster, she said she could hear children calling out to be saved.
“Children trying to scream for help,” Petra recalled. “I couldn’t go and swim to them or try to help them because I couldn’t move my legs. I couldn’t do anything.”
However, she told PEOPLE that after about half an hour, she could no longer heard their screams. "And that meant that they couldn't hold on," she said.
"I couldn’t swim out [to them] because I was trapped by debris That day, I couldn’t help. I had no choice.”
But those screams stuck with Petra and inspired her to start her worldwide Happy Hearts Fund.

Her work since
Months later (with four months of healing for her injuries), Petra returned to Thailand and helped to rebuild safer schools in the affected areas to support children.
“Hearing children screaming for help and not being able to help them, that leaves such a powerful mark," she told PEOPLE. "Today and every day, I have a choice to help.”
She then co-founded All Hands and Hearts to help global communities, doing volunteer work in more than 28 countries around the world.
All Hands and Hearts works with 53,000 volunteers from 116 countries and aims at addressing the immediate and long-term needs of communities impacted by natural hazards.
In 2017, she was officially recognised as the UNDRR World Tsunami Awareness Advocate by the United Nations.
Petra told The Guardian that she doesn’t think of her ordeal as a tragedy but that instead: “It is about overcoming adversity and how the tragedy can bring lots of light to the person who's experienced it and to many others around them.
"Wanting to help and not being able to – that was the hardest.”

How can I watch The Impossible?
On Sunday evening, at 10:30pm, The Impossible is airing on BBC One.
Starring Naomi Watts and Ewan McGregor, it also features a young Tom Holland in his live-action film debut.
The film received an array of nominations following its release in 2012 and is based on the experience of María Belón and her family in the 2004 Indian Ocean tsunami.
Maria (Watts), Henry (McGregor) and their three kids are enjoying a holiday in Thailand for Christmas when the tsunami hits the coastline, sweeping the family away in different directions. It follows their journey as they struggle to safety, hoping to find one another again.
The Impossible has an 81 percent rating on Rotten Tomatoes.