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https://en.wikipedia.org/wiki/Under_%28restaurant%29
>Under is an underwater restaurant in Lindesnes, Norway. Its dining room is found 5.5 metres (18 ft) below sea level. The eating floor is 495 square metres (5,330 sq ft), making it the biggest underwater restaurant in the world, with a capacity of 40 people. It is the only underwater restaurant in Europe, and only the third to be found worldwide. Under also doubles as a sea lab, facilitating research in marine biology.[1] The restaurant was designed by Norwegian architecture-firm Snøhetta.[2]