OVERVIEW: The S 116 Poseidon [Type 209-1200] is a diesel-electric attack submarine operated by the Hellenic Navy. Commissioned in 2011, the vessel represents a modern iteration of the proven Type 209 design, adapted to meet the specific operational requirements of Greece.

DETAILS:
The Type 209 diesel-electric submarine was originally developed by Howaldtswerke-Deutsche Werft (HDW) of Germany in the late 1960s as an export-oriented design, offering a capable and cost-effective platform for navies worldwide. The Type 209-1200 variant represents one of the early, smaller displacement iterations of this highly successful design. The design philosophy prioritized acoustic stealth, reliability, and ease of maintenance, resulting in a platform that could be effectively operated in diverse environments. The Poseidon, as a Type 209-1200, retains these core characteristics while integrating modernized sensors and systems to enhance its combat effectiveness. Its acquisition reflects Greece's strategic focus on maintaining a robust submarine force to safeguard its maritime interests in the Aegean Sea and the broader Mediterranean region. The enduring success of the Type 209 design is evidenced by its widespread adoption across numerous navies globally, attesting to its adaptability and overall performance.

The S 116 Poseidon is primarily designed for anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence, surveillance, and reconnaissance (ISR) operations. Its deployment within the Hellenic Navy reflects a focus on defending vital sea lanes, projecting power in regional waters, and conducting covert surveillance missions. The submarine is capable of operating independently or as part of a larger naval task force. Its diesel-electric propulsion system allows for extended submerged endurance at slow speeds, enhancing its stealth capabilities during ASW patrols. In ASuW engagements, the 533mm torpedo tubes provide the capacity to engage surface combatants and merchant shipping. The presence of a signal ejector indicates the capability for deploying countermeasures or communicating with shore-based assets while submerged, further enhancing operational flexibility.

The Poseidon's combat effectiveness is substantially enhanced by its sensor suite. The Shrike UME-100 electronic support measures (ESM) system provides the capability to detect, analyze, and geolocate radar emissions from surface ships, aircraft, and land-based installations, contributing to situational awareness and targeting. The CSU 90 suite, including hull-mounted, flank array, and intercept passive sonar (IPS) variants, constitutes the vessel's primary acoustic detection system, enabling the detection and tracking of submarines and surface contacts over considerable distances. The MAS 90 active sonar provides enhanced capabilities for target classification and ranging, particularly in shallow water environments. The submarine periscopes, equipped with optical and low-light television (LLTV) systems, facilitate visual observation and target identification on the surface. This sensor suite allows the Poseidon to effectively locate, identify, and engage both underwater and surface threats, while maintaining a high degree of stealth.

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

SENSORS: Shrike UME-100 || CSU 90 Hull || CSU 90 Flank || IPS CSU 90 || MAS 90 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: 533mm TT || 533mm TT || Signal Ejector