Commercial drilling crew successfully lowered and recovered Deep Fission's 20-foot prototype reactor canister using equipment already in commercial service in the drilling industry

Deep Fission, Inc. (NASDAQ:FISN) ("Deep Fission" or the "Company"), an advanced nuclear energy company developing small modular pressurized water reactors a mile underground, today announced that it has successfully installed and retrieved a full-size prototype reactor canister from a borehole using standard commercial drilling equipment operated by a commercial drilling and rigging crew. Nothing about the demonstration required equipment that had to be invented, custom-built, or adapted for nuclear service.