OVERVIEW: The SS 20 *Thomson* [Type 209-1300L] is a diesel-electric attack submarine operated by the Chilean Navy. The vessel represents a modern iteration of the venerable Type 209 submarine design, adapted to meet Chile's specific operational requirements in the southeastern Pacific.

DETAILS:
The Type 209 submarine was initially developed by Howaldtswerke-Deutsche Werft (HDW) of Germany in the late 1960s as a cost-effective and highly capable export submarine. It has become one of the most successful conventional submarine designs in history, serving with numerous navies worldwide. The Type 209-1300L variant, as represented by the *Thomson*, signifies a further evolution of the design, likely incorporating improvements in noise reduction, sensor integration, and automation compared to earlier models. The "L" designation likely denotes a specific modification package or batch of upgrades tailored for the Chilean Navy, possibly including enhancements to address the unique challenges of operating in the often-challenging waters of the South Pacific. The design philosophy emphasizes a balance between affordability, reliability, and operational effectiveness, making it well-suited for navies seeking a capable yet manageable submarine force.

The primary roles of the *Thomson* are Anti-Submarine Warfare (ASW), Anti-Surface Warfare (ASuW), intelligence gathering, and potentially covert insertion of special forces. As an ASW platform, the submarine utilizes its CSU 3-4 sonar suite for detection, tracking, and classification of underwater contacts. The IPS CSU 3 integrated processing system enhances the sonar's capabilities by providing advanced signal processing and display functions. In the ASuW role, the vessel employs its 533mm torpedo tubes to engage surface combatants. The Generic Surface Search Radar allows for detection and tracking of surface vessels at ranges beyond visual, particularly useful in adverse weather conditions or at night. The DR 2000U electronic support measures (ESM) system provides the capability to detect and analyze radar emissions from potential targets, offering an additional layer of situational awareness.

The *Thomson*'s sensor suite is crucial for effective operations. The combination of optical and low-light television (LLTV) periscopes provides visual and enhanced visual reconnaissance capabilities, allowing for detailed observation of surface targets or coastal areas. The Generic Submarine Periscope allows for conventional optical observation, while the Generic Submarine Periscope, LLTV provides enhanced night vision capabilities. The 533mm torpedo tubes provide the submarine with a potent offensive capability against both surface and subsurface targets. The integration of these systems allows the *Thomson* to conduct a wide range of missions effectively in the challenging operational environment of the South Pacific.

SPECIFICATION: Length: 59.5 m || Beam: 6.2 m || Draft: 5.5 m || Disp: 1265 t

SENSORS: Generic Surface Search Radar || CSU 3-4 || DR 2000U || IPS CSU 3 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 533mm TT