OVERVIEW: The S 116 Poseidon [Type 209-1200] is a diesel-electric attack submarine operated by the Hellenic Navy. Commissioned in 1979, it represents an early example of the widely exported Type 209 submarine design, specifically the 1200 variant.

DETAILS: The Type 209 diesel-electric submarine was developed by Howaldtswerke-Deutsche Werft (HDW) of Germany in the late 1960s as a cost-effective and reliable submarine for export. The design philosophy prioritized ease of maintenance, relatively shallow-water operations, and a strong anti-surface warfare (ASuW) capability. The Type 209-1200, the specific variant operated by Greece, represents a particular iteration of the design, optimized for the operational requirements and budgetary constraints of smaller navies. Its relatively small size and simple design made it attractive to nations seeking a modern submarine capability without the expense and complexity of nuclear-powered vessels or more advanced diesel-electric designs. The Poseidon and its sister ships played a crucial role in modernizing the Hellenic Navy's submarine force.

The primary roles of the S 116 Poseidon are anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence gathering. The submarine's diesel-electric propulsion provides a relatively quiet platform for ASW operations in the Aegean Sea and surrounding waters. Its torpedo armament allows it to engage both surface combatants and enemy submarines. The submarine's sensor suite, including the CSU 3-4 and PRS 3-4 sonar systems, are critical for detecting and tracking underwater targets. While primarily designed for offensive operations, the Poseidon's periscopes (optical and LLTV) also permit covert surveillance and reconnaissance activities, enhancing its value in littoral operations. The DR 2000U electronic support measures (ESM) suite allows the submarine to detect and classify radar emissions from surface vessels and aircraft, providing early warning of potential threats.

The S 116 Poseidon's combat effectiveness relies on the integration of its sensor suite and weapon systems. The CSU 3-4 sonar likely provides active and passive search capabilities, while the PRS 3-4 probably functions as a passive ranging sonar. The IPS CSU 3 integrated processing system likely fuses data from various sensors to provide a comprehensive tactical picture. The installation of the DR 2000U ESM suite is a key component of the submarine’s self-defense capability, alerting the crew to potentially hostile radar emissions and facilitating electronic intelligence gathering. The 533mm torpedo tubes provide the capability to launch a variety of torpedoes against surface and subsurface targets. The signal ejector serves as a means of deploying countermeasures or communicating with other units.

SPECIFICATION: Length: 55.9 m || Beam: 6.3 m || Draft: 5.5 m || Disp: 1180 t

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

ARMAMENT: Signal Ejector || 533mm TT