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UK engineering firm SMD has developed its modular remotely operated vehicle ( ROV ) , Quantum EV , for subsea exploration . It features a 25 kW electric thrust system as well as long - distance DC transmission capability and a locally managed DC power system , plus battery compatibility for tetherless working . SMD said Quantum EV was twice as efficient as rival ROVs and showed a 20 % increase in performance . The vehicle will undergo testing in the coming months and the first deliveries are scheduled for nine to 12 months .