**OVERVIEW:** The S 41 *Santa Cruz* [TR 1700] is a diesel-electric attack submarine operated by the Argentine Navy. One of two TR 1700 class submarines, the *Santa Cruz* represents a significant capability for Argentina's submarine force.

**DETAILS:**
The TR 1700 class submarine was designed and built by Thyssen Nordseewerke (TNSW) of Emden, Germany, in the early 1980s. The design was specifically tailored to Argentina's operational requirements in the South Atlantic, calling for a long-range, high-endurance platform suitable for both anti-surface warfare (ASuW) and anti-submarine warfare (ASW). The TR 1700's design incorporates a single-hull configuration, optimizing internal space and reducing drag, contributing to the boat’s underwater speed and maneuverability. Six submarines were initially planned, but only *Santa Cruz* and her sister ship, *San Juan*, were completed due to budgetary constraints and subsequent political instability in Argentina. The class was intended to modernize Argentina’s submarine fleet, replacing older platforms and providing a significant upgrade in terms of sensor technology, weaponry, and overall operational effectiveness.

The *Santa Cruz's* primary roles encompass anti-surface warfare, anti-submarine warfare, and maritime interdiction. She is capable of conducting long-range patrols, deploying covertly to strategic locations, and engaging both surface combatants and enemy submarines. While lacking air defense capabilities, the *Santa Cruz* can contribute to area denial operations. Her ability to operate independently for extended periods makes her a valuable asset for monitoring and controlling maritime chokepoints and protecting Argentina's maritime interests. The submarine's endurance allows for extended deployment far from friendly ports, maximizing her patrol range in the vastness of the South Atlantic.

The *Santa Cruz* is equipped with a suite of sensors designed to provide situational awareness and targeting data. The Sea Sentry III electronic support measures (ESM) system detects and analyzes radar emissions from surface ships and aircraft, providing early warning and allowing for passive targeting. The TRS 3100 Calypso III (DRUA 33C) sonar suite serves as the primary means of underwater detection and tracking. The CSU 3-4 and IPS CSU 3 integrated sonar systems provide additional detection and classification capabilities. The TSM 2255 fire control system integrates sensor data and weapon systems, enabling precise targeting of enemy vessels. The inclusion of both optical and low-light television (LLTV) periscopes enhances the submarine’s ability to conduct visual surveillance in various lighting conditions. The 533mm torpedo tubes provide a potent offensive capability against both surface and subsurface targets. The Signal Ejector allows for the launch of countermeasures and communication buoys.

**SPECIFICATION:** Length: 66.0 m || Beam: 7.3 m || Draft: 6.5 m || Disp: 2116 t

**SENSORS:** Sea Sentry III || TRS 3100 Calypso III [DRUA 33C] || CSU 3-4 || TSM 2255 || IPS CSU 3 || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

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