SMRTR Science & EngineeringFeb 11, 2026Interesting Engineering

Borehole nuclear: US firm’s mile-deep underground reactor gets funding boost

SMRTR summary

Deep Fission raised $80 million to develop revolutionary underground nuclear reactors installed one mile beneath Earth's surface, using natural geology to eliminate expensive pressure vessels and reduce construction costs by 80 percent. The startup partnered with Blue Owl Capital to deploy these 15-megawatt small modular reactors for powering AI data centers with 24/7 clean energy.

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