Thank you and perfectly described as well
IN had the same issue in P75I program, where they wanted a Sub with fuel cell based AIP. Scorpenes that we built here under TOT, seemed to have a AIP (think its called MESMA) but that wasn't fuel cell based. So they took the Scorpenes without the AIP, and wanted a AIP system retrofitted that wasn't even used by Germany and S Korea. Its good that DRDO managed to make a AIP, and it is said to be very quiet because of no moving parts as well (Spain seems to have this too). However this kind of super requirements, again meant that the fleet strength went low and 3 additional Scorpenes are going to be ordered. In contrast Pakistan went for Hangor class, and will soon be inducting 9 or something brand new subs.