**OVERVIEW:** The *Echo Voyager* is an Extra Large Unmanned Underwater Vehicle (XLUUV) submarine operated by the United States Navy. Commissioned in 2016, it serves as a testbed for autonomous underwater technologies and extended-range submerged operations.

**DETAILS:**
The *Echo Voyager* program emerged from a broader US Navy initiative to develop and evaluate unmanned underwater systems for a variety of roles. The vehicle's design emphasizes long endurance and autonomous operation, allowing it to conduct missions in areas inaccessible or too risky for manned submarines. Boeing, the prime contractor, leveraged its expertise in both manned and unmanned systems to create a modular platform adaptable to different mission profiles. The design philosophy prioritizes energy efficiency and reliability, crucial for extended submerged deployments. Early testing focused on validating the vehicle's autonomy, navigation, and communication capabilities. The *Echo Voyager* represents a significant step towards fielding a new generation of unmanned underwater assets capable of persistent ocean monitoring and other strategic missions.

While not designed for traditional combat roles, the *Echo Voyager* offers a platform for testing technologies applicable to future Anti-Submarine Warfare (ASW), Anti-Surface Warfare (ASuW), and mine countermeasure (MCM) capabilities. Its primary role is data gathering and experimentation, facilitating the development and refinement of autonomous navigation algorithms, sensor integration techniques, and underwater communication protocols. The extended endurance allows for persistent surveillance of strategic chokepoints and maritime areas of interest, providing valuable intelligence for naval planners. The data collected during these missions contributes to a better understanding of the underwater environment and informs the development of future unmanned underwater vehicle designs. The absence of crew makes it suitable for covert operations in high-risk environments.

The *Echo Voyager*'s sensor suite, while relatively basic, is sufficient for its designated role. The Generic Low Light Television (LLTV) system provides limited visual identification in low-light conditions. The Sonar Self-Noise and Ambient Monitoring (SSAM) system allows the vehicle to characterize its own acoustic signature and the surrounding noise environment, critical for optimizing sonar performance and maintaining stealth. The Generic Sonar Flank Array offers passive acoustic detection and localization capabilities, enabling the vehicle to detect and track surface and subsurface contacts at considerable range. The data collected by these sensors is processed onboard and transmitted to shore-based facilities for analysis. The modular design of the *Echo Voyager* allows for future upgrades to its sensor payload as technology evolves.

**SPECIFICATION:** Length: 15.54 m || Beam: 3.2 m || Draft: 3.0 m || Disp: 50 t

**SENSORS:** Generic LLTV || SSAM || Generic Sonar Flank Array

**ARMAMENT:** None