Indian Navy’s indigenous submarine programs gather steam
India’s homegrown submarine projects Project 76 and Project 77 are confirmed to be in the design stage even as Project 75(I) in collaboration with TKMS and Project 75(AS) with Naval Group are in various stages of progress.
Indian private firm Larsen and Toubro (L&T) and state owned Mazagon Docks Limited (MDL) are the two major firms involved in India’s submarine programs.
While L&T partnered with Navantia to offer the S80 for P75I, MDL tied up with TKMS and got selected to offer a design which can be described as a Type 214I. TKMS and MDL announced commencement of official contract negotiations for P75(I). P75I is a successor to P75 as planned in the 1990s. All six Kalvari class Scorpene submarines under P75 have been inducted, with efforts to integrate an AIP by DRDO and L&T facing delays. While the original plans as mooted during the conception of P75 were delayed and changed, the more recent plan to integrate the first submarine INS Kalvari with a domestic AIP plug has also been delayed. Currently, the second submarine INS Khanderi is likely to be fitted with the plug in 2026-27. The energy module is slated to be ready by December 2025 which then has to be integrated with a plug and inserted in the SSK during refit. New heavyweight torpedoes by DRDO will also be integrated.
Meanwhile TKMS is in talks with Indian firms for various systems required to be indigenized for the P75I program. On September 3, TKMS signed an MoU with VEM Technologies for collaboration in the field of heavyweight torpedoes along with Atlas Electronik. TKMS will also integrate its own AIP for the P75I, a key requirement that contributed to the delay in the program.
Artist rendering showing the future P75(I) submarine. TKMS image.
The first submarine under P75I will take seven years to deliver with 45% indigenous content while the sixth submarine will have 60% indigenous content. The delays to the P75I program, long lead time and high cost amidst Indian Navy’s aging undersea fleet led to the genesis of the P75(AS) program. Under this, three more modified Kalvari class submarines would be built by MDL, providing a stopgap to P75I and shoring up the Navy’s submarine fleet strength. While the contract was expected to be signed by March 2025 by the end of that financial year, that never occurred and the project is currently in limbo. Thus, surviving India’s glacial yet intense procurement process is the next hurdle for both the P75(AS) and P75I programs.
Work on an indigenous SSK program called P76 was known to have picked up steam in 2024, with the Chief of Naval Staff stating that preliminary work was underway on P76. L&T is confirmed to be part of the design process along with the Navy’s Directorate of Naval Design (Submarine Design Group) (DND-SDG). Six submarines are planned with a top L&T official stating that the design phase can be completed by 2026-27, with the first submarine produced in six to seven years and all six delivered in ten years. It is all but certain that the P76 program will be built in much larger numbers than currently envisaged given the expanding requirements of the Navy. A recent 15 year roadmap had included development of several key components for an Indigenous Conventional Submarine. P76 SSKs are likely to displace around 3000 ton and will be armed with indigenous torpedo tube launched cruise missiles.
Launch of MDL’s experimental midget submarine Arowana in 2024 (Photo by MDL)
Both MDL and L&T are developing capabilities for conventional submarine design by designing midget submarines. MDL launched its midget submarine “Arowana’ in May 2024 as a proof of concept, while stating that MDL is simultaneously working on development of design of full scale indigenous conventional submarine by 2028. MDL had revealed later in 2024 that several subsystems for P76 will be developed in-house by 2028, while in 2023 an MoU was signed with the DND-SDG for collaboration in R&D of technology and equipment for submarine applications.
L&T had started the design process in 2017 for a midget submarine based on Indian Navy requirements for special operations. The design known as SOV400 is currently on offer to the Navy. Capable of carrying eight commandos, the SOV400 has a displacement of nearly 500 tons. The 45 meter long submarine has a crew of 12 and is propelled by an electric motor. The submarine has two 533mm torpedo tubes. The Navy has a requirement for two midget submarines but the project has seen little progress. The SOV400 design continues to evolve, with defence news channel Chakra, which interviewed the senior L&T official mentioned previously, recently showing a design which has several differences compared to previous exhibits.
L&T SOV400 (Screenshot via Chakra)
The development of two P77 SSNs has been sanctioned with the current projection being for building six submarines under the program. The first submarine is expected to be delivered by 2036-37. L&T is confirmed to be a key partner in this project. The firm has been a part of India’s secretive SSBN program as well. Both P76 and P77 are expected to have high indigenous content of about 95%.
The Navy continues to progress its XLUUV and HEAUV programs, with the latter being developed by DRDO and CSL. The induction of these AUVs are expected to enhance the Navy’s underwater capability in the coming years when the crewed submarine fleet strength will remain concerning. Currently, 12 XLUUVs and up to 20 HEAUVs are required by the Navy.
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