The Regalor II program uses an ultra‑deep exploration well at Pontpierre, reaching around 3,655 m and targeting up to 4,000 m, to investigate the presence, concentration and genesis of natural hydrogen in the Lorraine Carboniferous basin.[1][9] It builds on previous Regalor work funded with academic partners, and is described as the first well in the world dedicated specifically to dissolved natural hydrogen, combining industrial drilling hardware with scientific instrumentation and sampling campaigns.[9]
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