OVERVIEW: The S 725 [PL-641 Foxtrot] is a diesel-electric powered submarine operated by the Cuban Navy. Believed to be one of three Foxtrot-class submarines acquired by Cuba, it was commissioned in 1979 and remains (as of this writing) one of the larger submarines in the Caribbean region.

DETAILS: The Project 641 (Foxtrot-class) submarine was developed by the Soviet Union as a successor to the earlier Project 611 (Zulu-class) and Project 613 (Whiskey-class) submarines. The Foxtrot design represented a significant improvement in underwater performance, incorporating a more streamlined hull for reduced drag and a more powerful propulsion system for increased speed and endurance. Intended primarily for anti-submarine warfare (ASW) operations, the Foxtrot-class was designed to patrol strategic areas of the ocean, interdicting enemy submarines and surface vessels. The class saw extensive service with the Soviet Navy and was widely exported to allied nations. The S 725 represents a late example of the class and likely incorporates some minor upgrades completed before its transfer to Cuba.

The primary role of the S 725 is assumed to be anti-submarine warfare (ASW) and anti-surface warfare (ASuW) within the Caribbean region. Given its age, it's unlikely to be involved in deep-ocean patrols, instead focusing on coastal defense and monitoring of key maritime chokepoints. The submarine's 533mm torpedo tubes provide a credible offensive capability against both surface ships and submarines. The inclusion of the Snoop Tray 1 [RLK-101 Albatross] radar system allows for surface search capabilities when operating at periscope depth, while the Acoustic Intercept [MG-23 Svet-M] provides the capability to detect and analyze enemy sonar emissions, enhancing its situational awareness. The Wolf Paw [GAS-372 Hercules-2M] sonar system is likely used for active and passive detection of underwater targets.

The installation of the Trout Cheek [MG-10M Feniks-M] sonar system provides improved medium-range underwater target detection capabilities, while the Pike Jaw [MG-200 Arktika] sonar further enhances the submarine's underwater acoustic picture. The Quad Loop DF system allows the submarine to direction-find radio transmissions, potentially aiding in intelligence gathering or targeting surface vessels using radio communications. The Generic Submarine Periscope and Optical sensors remain essential for visual observation and target identification at periscope depth. While a dated platform, the S 725's sensor suite still offers a considerable threat in littoral environments.

SPECIFICATION: Length: 91.3 m || Beam: 7.5 m || Draft: 5.1 m || Disp: 1952 t

SENSORS: Quad Loop DF || Stop Light B [Nakat] || Trout Cheek [MG-10M Feniks-M] || Snoop Tray 1 [RLK-101 Albatross] || Acoustic Intercept [MG-23 Svet-M] || Pike Jaw [MG-200 Arktika] || Wolf Paw [GAS-372 Hercules-2M] || Generic Submarine Periscope || Optical

ARMAMENT: 533mm TT