The US Navy is powering drone ships with Rolls-Royce engines which can drive for up to 30 days without human intervention

The US Navy approved Rolls Royce engines for autonomous surface vesselsThe certified engines can support missions lasting up to 30 daysSeries 4000 engines completed two separate 720-hour durability trialsThe US Navy has approved Rolls-Royce marine engines for unmanned vessels capable of operating for periods reaching 30 days without crews...