The destructive potential of tsunamis has been alluded to throughout history from witness accounts and scatterings of recorded observations. In December 2004, this potential was realized and graphically illustrated to world populations during the tsunami generated off the coast of Sumatra, Indonesia. The near-field and far-reaching effects of this event led the United States Congress to enact legislation to prepare and protect US coastal interests. The Warning and Education Act was passed in 2006 to formally establish “a tsunami forecasting capability based on models and measurements…” Just as hurricane forecasts rely on radar, buoy systems, aircraft, and satellite observations to predict and forecast the path of a hurricane following generation, timely and accurate tsunami forecasts rely on deep-ocean observations for real-time incorporation into forecast models following tsunami generation while the tsunami is propagating across the ocean. It is these deep-ocean observations that are the focus of this paper.