14 nautical miles out from one of Indonesia’s busiest ports, I’m standing waist-deep and wide-eyed in the waters of Bontosua Island. A far cry from the usual pace of island life, I watch a meticulous kind of chaos unfold, as community members, marine scientists and stakeholders from across Indonesia work in unison, dancing between baskets of floating coral, steel structures cartwheeling overhead and dodging trip hazards that lurk beneath water stirred up by a hundred feet. Mars’ latest and rather extraordinary mission is the world’s largest coral reef restoration event, The Big Build. 40 partners from across Indonesia have come together to restore 2,500 square metres of coral reef with 30,000 corals.