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Previous underwater drones were bulky industrial robots that were extremely expensive to buy, maintain and use, which discouraged hobbyist users. PowerRay has greatly reduced the cost of purchase and use, and also the difficulty of operation. It is now safe, low-cost and convenient to meet people’s curiosity about life below the sea. PowerRay can assist underwater operations in professional fields such as underwater filming, aquaculture, detection and rescue, and greatly reduce labor costs and safety risks.