The energy sector is witnessing a new frontier emerge as the race for underground hydrogen intensifies. Traditionally associated with fossil fuel exploration, the industry is now turning towards hydrogen deposits as a potential solution for sustainable energy production. Hydrogen, a vital component in various industries, holds the promise of greener fuel alternatives for aviation, shipping, and steelmaking. Contrary to previous beliefs, evidence suggests significant underground hydrogen reservoirs waiting to be tapped, primarily in iron-rich rocks like olivine where chemical reactions generate the gas under specific conditions. Startups like Addis Energy are venturing into this uncharted territory, exploring ways to harness subsurface resources to produce valuable chemicals like ammonia. While the idea of searching underground for resources may seem antiquated in today's high-tech age, it presents a unique opportunity to meet energy demands while addressing climate change. The search for hydrogen has led to accidental discoveries in abandoned mines and well sites, highlighting the potential for substantial hydrogen reserves. Companies worldwide are investing in geologic exploration to locate and extract these resources, with Australia's southern region emerging as a hotspot for hydrogen prospects. While the vast potential of underground hydrogen raises optimism for meeting long-term energy needs, challenges such as extraction economics, transportation limitations, and environmental impacts remain hurdles to overcome. The convergence of expertise from the oil and gas industry with the pursuit of underground hydrogen marks a strategic shift towards sustainable energy sources. Researchers are actively seeking innovative methods, like stimulating hydrogen production in non-traditional rocks, to broaden the accessible resources. Despite lingering uncertainties, the exploration of underground hydrogen signifies a crucial step towards combating climate change and striving for a greener future.