The OOI is based upon a scientific community vision resulting from two decades of workshops, meetings, and reports, that established science drivers for the observatory infrastructure. Science remains a central to the OOI, its technology, and its data. The OOI is structure around six major science themes covering the open ocean to the coast and the atmosphere to the seafloor. Though these were the major science themes that provided an impetus for the OOI design, the list is not exclusive. The OOI is an infrastructure program designed to provide data in near-real time to its user community, as such these data may be used to answer innumerable scientific inquiries.Science Prospectus.