Since 1980 the National Park Service (NPS) has maintained the Submerged Resources Center (SRC), the agencies only full time underwater diving program. Their mission is to support the inventory, management, and presentation of America’s underwater national parks. In his talk, SRC Deputy Chief and underwater photographer Brett Seymour will present a 35-year history of how SRC has adopted technical diving techniques in support of often non-technical operations. Brett will briefly discuss the Center's genesis in early cave and exceptional air exposure diving of the 70’s and 80’s that translated into mapping the USS Saratoga, USS Arizona, and the CSS Alabama. Through the lens of nearly 20 years of underwater imaging, Brett’s presentation will also focus on how the SRC has utilized closed circuit rebreathers to standardize team equipment configuration and streamline logistics across the wide operational and environmental setting of the NPS underwater world and beyond.