"Three miles off Norway’s rugged coast, 1.5 million salmon swim in a 220-foot-high, football-field-long mass of floating mesh-wire frames and nets. This is Ocean Farm 1, the world’s first deep-sea aquaculture project, designed by leading salmon farmer SalMar ASA. The company paid China Shipbuilding Industry Corp. $300 million upfront for six facilities that offer more space than conventional shoreline farms (large nets in sheltered waters) while diffusing fish waste, allowing them to be packed in tighter."
https://www.bloomberg.com/news/articles/2018-07-30/this-300-million-deepwater-platform-houses-1-5-million-salmon
https://www.bloomberg.com/news/articles/2018-07-30/this-300-million-deepwater-platform-houses-1-5-million-salmon