Deep Fission Demonstrates Full-Scale Reactor Canister Deployment Using Standard Drilling Equipment — Deep Fission, Inc.

Event summary

Deep Fission successfully installed and retrieved a full-scale reactor canister prototype using off-the-shelf drilling equipment on September 3, 2026.
The 20-foot canister was lowered to 100 feet depth inside a 34-inch-wide borehole and returned to the surface.
The demonstration used commercially available drilling rigs and rigging, requiring no custom nuclear adaptations.
Deep Fission received U.S. Department of Energy approval for its Nuclear Safety Design Agreement (NSDA) for the Gravity™ Nuclear Reactor.

The big picture

Deep Fission's ability to deploy its reactor using existing drilling infrastructure and proven pressurized water reactor technology could significantly reduce the cost and complexity of nuclear energy projects. This approach aligns with broader industry trends toward smaller, modular, and more flexible nuclear power solutions, potentially accelerating adoption in markets with high electricity demand and strict regulatory environments.

What we're watching

Regulatory Progress: The pace at which Deep Fission advances through regulatory approvals will determine its commercial deployment timeline.
Commercial Viability: Whether Deep Fission can sustain its cost and safety advantages while scaling its underground reactor model.
Industry Adoption: How the success of this demonstration will influence utility and industrial customer interest in small modular reactors.