Researchers have developed an aquatic robot that will make it extremely difficult for smugglers to hide contraband in the hulls of ships.

With a shape akin to a somewhat distorted bowling ball, the 3-D printed device can be made for around $600 as a much less expensive way to inspect ships at port, Engadget reported via MIT News.

“It’s very expensive for port security to use traditional robots for every small boat coming into the port,” Sampriti Bhattacharyya, a graduate student in mechanical engineering, said in a statement. “If this is cheap enough–if I can get this out for $600, say–why not just have 20 of them doing collaborative inspection? And if it breaks, it’s not a big deal. It’s very easy to make.”

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