Shells and Olivine reimagines Manhattan’s west side by transforming a disused Marine Transfer Station into a model of ecological innovation. “Shells” reference both the abandoned steel structure and oyster shells that filter and improve water quality. “Olivine,” a common green mineral, naturally captures carbon through weathering, a process accelerated by tidal movement. The proposal combines oysters and olivine within durable gabion cages, creating a low-maintenance cycle lasting about thirty years. A public walkway links the site to surrounding parks, encouraging exploration and education. This design merges urban infrastructure, public access, and environmental restoration into a replicable system for cleaner waterways.