A new system uses large-scale mechanized seaweed farming to produce carbon-negative biofuels, bioplastics, and other products. This scalable, ocean-based agriculture provides sustainable alternatives to fossil fuels, operating in India and Indonesia. To address unsustainable land-based agriculture and the limited renewable feedstocks for bioplastics and biofuels, a new system develops large-scale, mechanized seaweed farming in oceans. This system efficiently converts seaweed biomass into various sustainable products, including carbon-negative biofuels, bioplastics, biostimulants, and food ingredients. Operating in India and Indonesia, this initiative offers a scalable, environmentally friendly alternative to fossil-based products, as demonstrated by its partnership with HPCL for biofuel R&D and recent $18.5M Series B funding.