Five meters below the surface of the North Sea, near the southernmost tip of Norway, Europe’s first underwater restaurant is now complete.

The 110-foot long structure, an oblique concrete slab that looks like a sunken periscope, was submerged in July 2018 and welcomed the first guests on March 20.The restaurant, called Under, is the design of Norwegian outfit Snøhetta, which has made a name for itself with projects such as the Bibliotheca Alexandrina in Egypt, the Oslo Opera House, the National September 11 Memorial Pavilion and the renovation of Times Square in New York.

Under sits up to 40 guests, protected by concrete walls half a meter (1.6 feet) thick, and has a total internal area of about 500 square meters (5,300 square feet) set over three levels, offering unique underwater views of the surrounding marine environment through a 11-meter (36 feet) wide panoramic window.