During a pelagic longline pilot study conducted by the National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southeast Fisheries Science Center, Mississippi Laboratories along the US Atlantic Ocean coast (NOAA Ship OREGON II OT-06-02-269), a Caretta caretta (Loggerhead Sea Turtle) was captured with longline gear equipped with time-temperature-depth recorders attached in proximity to hooks. Time-temperature-depth data documented changes in hook depth and water temperature, and reflected behavior of the Loggerhead Sea Turtle (rates of descent and ascent, time at depth, time near surface). Sea turtle mortality mitigation recommendations for pelagic longline gear proved effective for this Loggerhead Sea Turtle capture since there were successive ascents to surface, and the viability status was good after landing.