OVERVIEW: The S 139 Hamza [Khalid Class, Agosta 90B] is a diesel-electric attack submarine (SSK) operated by the Pakistan Navy. Launched in 2006, it represents an enhanced variant of the Agosta 90 design, tailored to meet Pakistan's specific operational requirements.

DETAILS: The Agosta 90B, also known as the Khalid class in Pakistani service, emerged as a significant upgrade to the earlier Agosta 70 design. The primary design philosophy focused on improving stealth characteristics, enhancing sensor performance, and providing greater operational endurance compared to its predecessor. The modifications included the integration of a MESMA (Module d'Energie Sous-Marine Autonome) air-independent propulsion (AIP) system for extended submerged operations, which was not ultimately fitted to the Hamza but was part of the design consideration. The AIP system, when installed on other Khalid class boats, reduces the submarine's reliance on snorkeling to recharge batteries, dramatically increasing underwater endurance and reducing its vulnerability to detection. The program was intended to give Pakistan a technological edge in the Indian Ocean.

The S 139 Hamza is primarily tasked with anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence gathering roles. Its ASW capabilities are enhanced by the TSM 2233M Scylla sonar suite, incorporating the DSUV 2H towed array and DUUA 2D flank array sonars, providing long-range detection and classification of underwater targets. ASuW capabilities rely on its ability to deploy torpedoes against surface vessels and, potentially, anti-ship missiles through its 533mm torpedo tubes. The submarine's overall stealth design and advanced sensors make it well-suited for covert operations, including surveillance and reconnaissance missions. The vessel’s ability to operate quietly and for extended periods in littoral environments is a key asset.

The S 139 Hamza boasts a comprehensive sensor suite. The TRS 3100 Calypso III radar (designated DRUA 33C in some documentation) provides surface search and navigation capabilities. The DR 3000U electronic support measures (ESM) system allows for the detection, identification, and localization of radar emissions from surface ships and aircraft, enhancing situational awareness. The TSM 2255 fire control system enables precise targeting and engagement of both underwater and surface threats. The TSM 2933 Lamproie is a decoy launching system designed to counter incoming torpedoes. Furthermore, the inclusion of both optical and low-light television (LLTV) submarine periscopes provide visual situational awareness in different lighting conditions. The TSM 2243 is likely a hydrophone array used for passive sonar detection and ranging.

SPECIFICATION: Length: 67.6 m || Beam: 6.8 m || Draft: 5.4 m || Disp: 1490 t

SENSORS: TRS 3100 Calypso III [DRUA 33C] || DR 3000U || TSM 2233M Scylla [DSUV 2H + DUUA 2D] || TSM 2255 || TSM 2933 Lamproie || TSM 2243 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: Signal Ejector || 533mm TT