The Chinese military is developing a fleet of new submarines that will navigate the ocean without a human crew, according to scientists involved in the project. The submarines will be powered by Artificial Intelligence (AI), allowing them to navigate independently and work alongside existing fleets. The crew-less submersibles will be relatively large and low-cost compared to other military watercrafts, according to scientists working on the project. The AI submarines are rumoured to be fitted with diesel-electric engines to enable them to stay at sea for several months without returning to dock. China will use these unmanned subs for intelligence gathering missions, planting sea mines, and'kamikaze'-style attacks on high-value targets, the scientists said.