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How Nuclear Submarines Are Powered: Inside the Reactor That Lets Them Cross Oceans Without Surfacing Nuclear-powered submarines are among the most complex engineering systems ever built. Unlike diesel-electric submarines, which must surface or snorkel regularly to recharge batteries, nuclear submarines can remain submerged for months at a time. Their endurance is limited mainly by food supplies and crew endurance—not fuel. At the heart of this capability is a compact nuclear reactor system designed to produce continuous heat for years without refuelling. That heat is converted into mechanical energy that drives propulsion systems and generates electricity for every onboard system. This article explains, step by step, how nuclear submarines are powered—from the physics inside the reactor core to the propeller pushing thousands of tons of steel through the ocean. 1. The Core Idea: Turning Nuclear Fission into Motion Nuclear submarines are powered by nuclear fission, the process where hea...