Mazagon Dock Shipbuilders Limited (MDL) holds a unique position in India's defence ecosystem: it is the country's only builder of submarines and one of only two major naval shipyards (along with Cochin Shipyard). This monopoly on submarine construction gives MDL a competitive position that no other listed defence company in India can replicate — no private sector entrant has the technical knowledge, infrastructure, or government clearances to build naval submarines.
The Submarine Programme
MDL is executing the Project 75 (P75) programme — building 6 Scorpene-class conventional submarines in collaboration with DCNS (now Naval Group) of France. Each submarine costs approximately ₹5,000-7,000 crore. The programme has run beyond its original schedule (submarine programmes globally are notorious for delays) but all 6 boats are now delivered. The follow-on Project 75I (P75I) programme for 6 advanced conventional submarines with AIP (Air-Independent Propulsion) is the next major contract — estimated at ₹43,000+ crore total and MDL is the natural incumbent.
Surface Warships: The Destroyer Programme
MDL is simultaneously building four P15B Visakhapatnam-class guided missile destroyers for the Indian Navy — the most advanced surface combatants in India's naval inventory. Each destroyer is approximately ₹7,000-9,000 crore. Three of four have been delivered; the programme is nearing completion, and discussions for the successor P15C programme have begun.
- Order book FY25: ~₹38,000 crore
- P75 submarines: all 6 delivered (FY25)
- P15B destroyers: 3 of 4 delivered (FY25)
- EBITDA margin: ~12-14% (cost-plus defence contracts)
- P75I programme (upcoming): ₹43,000+ crore (MDL frontrunner)
🔍 BBS Insight
MDL is the most defensible business model in India's listed defence universe — a literal monopoly on submarine construction in a country that is rapidly expanding its naval capabilities to counter China's maritime presence. The risk is execution delay (defence programmes always run late) and the political risk that P75I is awarded differently than expected. Track the P75I tender timeline as the primary near-term catalyst — an award to MDL would add ₹43,000 crore to its order book, nearly doubling the current backlog. That is a transformational event for the stock.