French natural-hydrogen exploration startup developing geoscience tech to detect underground hydrogen reserves.
| Date | Round | Amount |
|---|---|---|
| May 2026 | Series A Mantle8 (Grenoble) raised 31M euros in a Series A led by Sandwater, with Breakthrough Energy Ventures and Bpifrance, for its global natural hydrogen exploration and drilling program. | $36M |
| Mar 2026 | Grant France's Mantle8 secured a EUR 2.06M EU Just Transition Fund grant to scale its natural-hydrogen discovery technology. | $2.4M |