[Answer] Where is the world's deepest underwater sinkhole?

Step 1 : Introduction to the question "Where is the world's deepest underwater sinkhole?"

...1. Mediterranean Sea 2. South China Sea 3. Caribbean Sea 4. Adriatic Sea

Step 2 : Answer to the question "Where is the world's deepest underwater sinkhole?"

South China Sea - Blue holes are deep underwater caverns or sinkholes in the middle of the ocean that create a distinctive blue circle on the water’s surface. In 2016, researchers discovered the deepest of these sinkholes in the South China Sea. The Dragon Hole (also known as the Yongle Blue Hole) stretches 987 feet below the surface, a measurement taken using an underwater robot with a depth sensor. Located in a coral reef off the Paracel Islands, the Dragon Hole took over the title from Dean’s Blue Hole in the Bahamas, which was previously the world’s deepest underwater sinkhole with a depth of more than 660 feet.:

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