The tuna has a natural body framework ideal for unmanned underwater vehicles (UUVs), solving some of the propulsion and maneuverability problems that plague conventional UUVs. BIOSwimmer™ is a UUV inspired by the tuna and designed for high maneuverability in harsh environments, with a flexible aft section and appropriately placed sets of pectoral and other fins. Credit: Composite image by Jane Baker, DHS S&T