TheTechno Optimist.

Gravity ReactorDeep Fission—Deep Fission raises $80 million in Series B to accelerate Gravity reactor commercializationGravity ReactorDeep Fission—Deep Fission breaks ground on Gravity reactor pilot at Great Plains Industrial Park, Parsons, KansasGravity ReactorDeep Fission—DOE approves Deep Fission's Nuclear Safety Design Agreement for Gravity reactor

Gravity Reactor

by Deep FissionUS

15 MWe pressurized water reactor in a 1-mile borehole. Geology and hydrostatic pressure provide containment and passive cooling.

PilotStage 3 of 5

Drilling and canister installation underway at Parsons. DOE NSDA approved August 2026. Timeline extended.

Updated Aug 2026Checked 10 Oct0 updates this week

Milestones

Next · Large-diameter well drilling and canister installation
  1. Deep Fission founded2023Complete.
  2. Pre-seed funding from 8VCAug 2024Complete.
  3. Series A fundingSep 2025Complete.
  4. Reverse merger with Surfside Acquisition; FISN begins trading5 Sep 2025Complete.
  5. Groundbreaking at Parsons, Kansas9 Dec 2025Complete.
  6. DOE approves Nuclear Safety Design AgreementAug 2026Complete.
  7. First data acquisition well drilled to 6,000 feetAug 2026Complete.
  8. Prototype reactor canister delivered to siteSep 2026Complete.
  9. Large-diameter well drilling and canister installationTarget Q4 2026Current milestone.
  10. Criticality and power operationsTarget 2027Not yet reached.

Most important updates

Upcoming

  1. Q4 2026Large-diameter well drilling and canister installation (next)
  2. 2027Criticality and power operations
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