OVERVIEW: The SS 20 *Thomson* [Type 209-1300L] is a diesel-electric submarine operated by the Chilean Navy. The vessel represents a variant of the widely exported German Type 209 submarine family, specifically the 1300L variant.

DETAILS:
The Type 209 submarine was developed by Howaldtswerke-Deutsche Werft (HDW) of Germany in the late 1960s as a cost-effective, yet capable, submarine for export markets. The design philosophy emphasized reliability, ease of maintenance, and adaptability to a variety of operational environments. The Type 209-1300L represents a slightly enlarged version of the initial design, incorporating improvements based on operational feedback and technological advancements. These improvements generally include enhanced sensors, improved crew comfort, and increased endurance. The choice of the Type 209 by Chile reflects the country’s historical reliance on German shipbuilding expertise and the design’s suitability for the operating conditions found along the Chilean coast.

The *Thomson*'s primary roles encompass anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence, surveillance, and reconnaissance (ISR) operations within Chile's exclusive economic zone. The submarine's diesel-electric propulsion system provides a balance between submerged endurance and operational range. While primarily focused on defense, the *Thomson* also contributes to maritime security and enforcement of Chilean sovereignty. The vessel can be deployed for extended periods, conducting patrols and monitoring maritime traffic.

The installation of a generic surface search radar provides the submarine with an independent surface surveillance capability, allowing it to detect and track surface vessels even in challenging weather conditions. The CSU 3-4 sonar suite, augmented by the Porpoise system, enables the *Thomson* to detect, classify, and track underwater contacts. The IPS CSU 3 likely provides integrated processing of sonar data, improving situational awareness. The combination of an optical periscope and a low-light television (LLTV) equipped periscope enhances visual observation capabilities, particularly in low-light conditions. These sensors collectively enable the submarine to effectively perform its assigned roles in both littoral and open-ocean environments. The 533mm torpedo tubes provide the submarine with a potent offensive capability against both surface and subsurface targets.

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

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

ARMAMENT: 533mm TT