OVERVIEW: The SST-4 Mod 1 Seeaal is a heavyweight, submarine-launched, electrically powered anti-ship torpedo developed by West Germany and exported to Argentina. It is an improved version of the SST-4 Mod 0, featuring wire guidance and passive acoustic homing for engaging surface vessels.

DETAILS: "SST" stands for "Super Schwerer Torpedo" (super heavyweight torpedo), and the SST-4 Mod 1 is a modernized variant of the DM-2-based SST-4 Mod 0. Introduced in the early 1980s, the Mod 1 configuration added refinements to the acoustic seeker, improved wire-guidance reliability, and enhancements to propulsion and control systems. The torpedo retains its electric drive, silver-zinc battery power, and passive acoustic homing capability, optimized for use against surface ships in coastal and blue water environments. Argentina was the primary confirmed operator of the SST-4 Mod 1, which was integrated into its Type 209/1200 submarines.

TYPE: Heavyweight Anti-Ship Guided Torpedo

FUNCTION: The SST-4 Mod 1 is launched from 533 mm submarine tubes, guided initially by wire and transitioning to passive acoustic homing in the terminal phase. It is designed to approach targets silently and strike enemy surface ships with a high-explosive warhead under conditions of minimal acoustic detection.

NOTE:
IOC: 1980 (SST-4 Mod 1)
Manufacturer: West Germany (Atlas Elektronik)
Operators: Argentina
Platforms: Type 209/1200 submarine (ARA Salta)

SOURCE:
Jane’s Naval Weapon Systems ; Federation of American Scientists (FAS): https://man.fas.org/dod-101/sys/ship/weaps/index.html ; GlobalSecurity.org: https://www.globalsecurity.org/military/world/europe/sst-4.htm ; Naval Institute Guide to World Naval Weapon Systems ; Wikipedia: https://en.wikipedia.org/wiki/SST_(torpedo)