Kansas Becomes Testing Ground for a Radical Nuclear Reactor Design | OilPrice.com Haley Zaremba Haley Zaremba is an energy journalist and researcher with more than a decade of professional experience covering global energy systems, land and natural resources, and… More Info Premium Content By Haley Zaremba – Jul 11, 2026, 4:00 PM CDT Deep Fission's prototype reactor canister has arrived at its Kansas test site, moving the startup toward large-diameter drilling and its first proof-of-concept underground reactor. The company says burying its "gravity reactor" a mile underground could cut operational costs by up to 80% by using natural water pressure…