Taking marathon running to another level. History awaits.
The Challenge
In October 2025, 45 intrepid runners will take on an extraordinary challenge: to run the deepest marathon ever run. Covering 42.2km within the Garpenberg Zinc Mine in Sweden, they will descend to a staggering depth of 1,120 metres below sea level. No one has attempted a marathon at this depth before. Participants will endure temperatures of up to 30c, total silence and will be running in complete darkness with only their head torches for light.
This pioneering event is being hosted by Boliden, owners of Garpenberg Mine and the headline sponsor of the ‘World’s Deepest Marathon’. As one of the world’s safest mining companies, Boliden has ensured that safety remains paramount. Runners will be equipped with personal protective equipment and have access to rescue chambers, adhering to stringent protocols designed to protect them in this unique subterranean environment.
Organised by learning and development specialists BecomingX, co-founded by adventurers Bear Grylls and Paul Gurney and the International Council for Mining and Metals, this historic endeavour captures the spirit of exploration and human resilience, and proves that limits can always be redefined. From the depths of the earth, these trailblazers will push beyond physical and mental boundaries to make history in one of the most extreme environments imaginable.
Fundraising
The World’s Deepest Marathon aims to raise $1m for two charities, BecomingX Foundation and Wild at Heart. Most participants are aiming to raise $30,000 each.
BECOMINGX FOUNDATION
BecomingX Foundation aims to create a world where everyone can realise their potential, no matter what their starting point in life.
WILD AT HEART FOUNDATION
Wild at Heart Foundation fund and support animal welfare projects all over the world. They aim to compassionately reduce the world's stray dog population through sterilisation, education and welfare programmes.
BecomingX is proud to partner with ICMM and Boliden to organise the ‘World’s Deepest Marathon’ - an event that embodies our message that we all have the potential to achieve extraordinary things. This will be a true test of resilience and, mental and physical focus. Running a marathon is tough, but doing it 1,120 metres below sea level, in total silence and darkness, will push participants to their limits. This is about more than breaking records - it’s about proving what’s possible when we dare to push beyond our perceived boundaries and into the unknown.
Bear Grylls OBE
BecomingX co-founder
Garpenberg - The world’s most productive Zinc mine
Boliden are hosting The World’s Deepest Marathon in Garpenberg, Sweden. In Hedemora municipality, Garpenberg is one of the world's most modern mines, extracting 3.5 million tonnes of complex ores containing zinc, lead, silver, copper and gold. Around 1 per cent of the world´s zinc concentrates are produced here. Mining has been conducted here since 350 years B.C. Today, mining is carried out with industry-leading and largely automated technology, Garpenberg is operationally reliable, eco-friendly and cost effective.
By caring for people, the environment and society, and by using their extensive experience, high-level skills and leading technology, Boliden aims to provide the metals essential to improve society for generations to come.
THE organisers
The World’s Deepest Marathon is organised by BecomingX in collaboration with our hosts Boliden and industry champions ICMM. Together we aim to showcase human potential and the power of the mining industry to create a brighter, cleaner future for all.
For a century, Boliden has been exploring, extracting and processing base metals and precious metals. Our production is based on experience, innovation and modern technology, developed in collaboration with Nordic technology and engineering companies. Today, we are an industry leader in terms of sustainable metal production from deposits to recycling used metals.
ICMM’s goal is to make responsible mining the global standard - creating safer workplaces, reducing environmental impact, and strengthening social outcomes. By driving higher industry standards, we will deliver high-impact improvements while fostering transparency, accountability, and trust in mining’s role in society.
BecomingX is a learning and development company set up to help people to realise their potential. To become the high performers. The game changers. The outliers. We know what it really takes to succeed and we equip people with the attitudes and skills to excel, no matter what their starting point.
