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A steel structure is dropped into the Adriatic Sea to create an artificial reef near the coast of Zadar, Croatia, Feb. 17, 2021. (Marko Dimic/Pixsell via Xinhua)
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A steel structure is dropped into the Adriatic Sea to create an artificial reef near the coast of Zadar, Croatia, Feb. 17, 2021. (Marko Dimic/Pixsell via Xinhua)