Belgians Florence Lutje Spelberg and Nicolas Mouchart dive next to "The Pearl", a spheric dining room placed 5 metres underwater in the NEMO33 diving center, one of the world's deepest pools (33 metres) built to train professional divers, before enjoying a meal inside, in Brussels, Belgium January 30, 2017. The restaurant, where an underwater meal costs 99 euros ($106) per person, took more than a year to build and multiple attempts were needed to perfect the design, mechanics and food delivery system. [Photo/Agencies]