Sea Dart

Leidos introduced Sea Dart in April 2025 as a compact uncrewed undersea vehicle family for lower-cost naval, commercial and research missions. The tested six-inch and nine-inch variants are transportable by one or two people and accept customer-selected payloads. Both use the U.S. Navy’s preferred underwater-vehicle software architecture and are compatible with its non-propagating UUV battery design.

Payload and configuration determine the mission, with Leidos identifying mine countermeasures, underwater survey, infrastructure monitoring, battlespace preparation and environmental sensing. The company states that Sea Dart can operate for hours at tactically relevant speed and depth while supplying substantial payload power. Engineers moved both standard diameters from concept to functional testing within a year; a larger 12.75-inch version remains under consideration and is not treated as a current production variant.