The discovery of naturally occurring underground pockets of pure hydrogen is challenging the traditional notion that hydrogen mainly exists in combination with other elements. The US Department of Energy has recently allocated $20 million in research grants to 18 teams to develop technologies for harnessing geologic hydrogen as a clean fuel source. Geologic hydrogen is generated when water reacts with iron-rich rocks, creating an opportunity for carbon-free power production. MIT Assistant Professor Iwnetim Abate's research group, a grant recipient, aims to optimize conditions for underground hydrogen production to enhance efficiency for large-scale operations. The US Geological Survey estimates vast amounts of geologic hydrogen are present in the Earth's crust, attracting interest from startups and researchers worldwide. The pursuit of geologic hydrogen aligns with the global shift towards carbon-free energy alternatives, with initiatives like 'green hydrogen' becoming increasingly important. While current commercial hydrogen production methods often involve fossil fuels, geologic hydrogen offers a sustainable solution. Various institutions and private companies, including Colorado School of Mines and Koloma, are exploring different approaches to extract and utilize geologic hydrogen. Despite the challenges and uncertainties surrounding natural hydrogen production, experts believe in the potential of this renewable resource to revolutionize the energy sector. Stimulating hydrogen production and controlling the reaction between water and rock could lead to a significant reduction in fossil fuel dependency, offering a promising path towards a sustainable energy future.