Series A · Climate Tech · Grenoble, France · Founded 2024 · 11–50 employees
Mantle8 is a deep-tech natural hydrogen exploration company that combines geology, geophysics, geochemistry, and seismic data to create highly accurate predictive models. The company utilizes its proprietary 4D multiphysics subsurface imaging platform, HOREX®, to visualize underground hydrogen-generating systems. In May 2026, the startup secured a €31 million Series A funding round to advance its goal of delivering geological hydrogen at a projected production cost of €0.80/kg. Additionally, the company was awarded a €2.06 million EU Just Transition Fund grant in March 2026 to scale its technology platform.
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