This 2010 expedition set out to explore the deep fore-reef in TOTO (Tongue Of The Ocean) from 50 to +/- 120 m, noting anomalous/dramatic geological formations associated with historic sea-level changes, and unique biological/ecological diversity of the deep reef ecosystem. The west margin of TOTO (east coast of Andros) is the 3rd largest barrier reef system in the world, and still remains largely unexplored. This presentation will highlight all aspects of this expedition, from its historical context, to on-site operations, to its discoveries.