During the last 35 years, NSTL has taken up a number of research and user oriented projects within its charter of duties and completed most of the tasks.


The main focus of the task is to make Navy self-reliant in underwater weapons. The domain of work includes torpedoes, mines, counter measures, targets, decoys and fire control systems. In order to carryout the complex task of designing underwater systems certain minimum unique infra-structural facilities are essential. Therefore some unique facilities like Acoustic Test Facility, Acoustic Tank Facility, High Pressure Test Chambers, Torpedo Engineering Centre (TEC), Electrical Propulsion Test Centre (EPTC) are created to carryout the underwater weapons development.


NSTL has taken up a two-pronged approach for development of a light weight anti submarine torpedo and a heavy weight wire guided torpedo Varunastra, Takshak, Thermal Torpedo that can be fired against a ship or submarine. This approach has resulted in optimum utilization of the technologies common to both light weight torpedo and heavy weight torpedo. NSTL is at the threshold of light weight torpedo is under production by Navy and technology demonstration of heavy weight torpedo.

LIGHT WEIGHT TORPEDO (Advanced Experimental Torpedo) 

Light Weight Torpedo (Advanced Experimental Torpedo) is an anti-submarine weapon which can be fired from a flying/hovering helicopter very close to the previously known location of enemy submarine to have a definite kill probability. The torpedoes can also be fired in a quick salvo from surface ships using torpedo Triple Tube Launchers (TTL).

Several front-end technologies are developed for the first time in the country making it self reliant. Several other products using state of art materials such as composites, titanium alloys are incorporated to bring down the total weight of the torpedo without sacrificing the strength requirements. High power sea water activated batteries in compact size to fit into the 324 mm dia shells, contra rotating DC propulsion motors are the contribution of this project. Sensor instrumentation packages, hybrid control and guidance motors are fabricated within the country which were denied under the Technology control regimes. Development of the light weight torpedo has resulted in several indigenous products which were hither to imported. The fully integrated torpedo consists of 95% of indigenous components and sub-systems.

The torpedo is capable of operating at depths of few hundred meters and homes on to its prey by passive/active homing and explodes on impact to destroy/damage the target submarine. Torpedo, on entry into water, performs pre-programmed search patterns, detects the targets and homes on to the target. Many user evaluations were conducted. The torpedo met all of its required specifications and user acceptance criteria as stipulated by the user and production orders are placed on M/s. BDL, Hyderabad by the Indian Navy.  

NSTL DRDO In order that the Indian Navy crew are battle ready at all times, they need to carry out repeated torpedo firing in quick succession. Use of real torpedo is extremely costly and therefore they need a practice torpedo which exactly simulates a real service torpedo. For this purpose NSTL designed, developed and produced a Drill and Practice torpedo equivalent to an Italian A-244S torpedo, which is in the arsenal of Indian Navy.

  • Drill and practice torpedo consists of 95% indigenous components and results in FE savings to the extent of 90% on each system. It costs only one sixth of an imported D&P torpedo. Navy is extensively making use of this D&P torpedo.
  • Hydraulic Fin Actuation system has been developed.
  • All shells have been designed, structurally analysed , fabricated and pressure tested.
  • Chopper for speed variation is designed and developed and functionally tested. PJP is designed and manufactured.
  • Design of Seals for 100 bar is completed for HWT. Pressure Chamber for Frontal Seals is developed and tested for 100 bar pressure.
  • Software for design of Super Cavitating Propellers has been developed.
  • Underwater Ranges (MCMV, SS and Acoustic ) have been commissioned at Goa.
  • A Two Stage Mounting System has been developed for motor driven compressor and installed onboard IN Ship for noise and vibration reduction.
  • Instrumentation Radar for RCS Ranging of Naval Ship has been established for the first time in the country.