The Nautilus Reef is a champion-themed artificial reef, which now resides as a place for marine life to grow around in Moreton Bay, off the coast of Queensland, Australia.
It was made possible thanks to the Oceanic League of Legends community rallying together for the in-game event Ocean Week 2015.
You can find out more about the project here: http://promo.oce.leagueoflegends.com/en/oceanweek-reef/index.html