From the link:
Based in La Spezia, conveniently near to the Italian naval Special Forces (COMSUBIN), Drass were close neighbors of Cos.Mo.S during the time that the latter was a major midget submarine and SDV exporter. So it is not entirely Surprising that Drass have taken over the Cos.Mo.S designs after they went out of business (see notes
HERE).
Although the fundamental designs are established classics from Cos.Mo.S, Drass has incorporated up to date lithium-ion battery technology, a new control and navigation module and the latest generation of sensors.
the 450 seems to be a new design though, its very boxy. Wonder if that helps with stealth. Design suggests this would be a relatively slow submarine. Which compromises the main mission of a simple design that vectors to an Indian port, lets loose, and hurries back home.
More than the SDV component, I'm interested in a suicide UUV armed with torpedoes.
Get to the vicinity of an Indian port, launch UUVs, mine anticipated enemy vectors, get out of there. Given open source information (and admittedly a complete lack of professional expertise in the field), the above just seems to most practical and effective solution.
Get a separate special forces delivery submarine for a Kutch landing, and to neutralize Dwarka.
DS4 4-man SDV
The DS4 is a minimal evolution of the Cos.Mo.S CE4F project for the
Turkish Navy's SAT (Su Altı Taarruz) in the late-1990s to early-2000s.
Mini submarines meant havoc and took down hundreds of thousands of tons of enemy shipping in WW2. The natural inclination has always been to make things bigger and badder, in almost any weapons system other than perhaps small arms. With lithium-ion batteries, there is a really effective solution here that would force IN to spend a good portion of its resources in defense.
Imagine also the moral and psychological victory of Indian ports burning. It would be in the news worldwide and something to remember for decades.
You could even have an SDV with torpedoes, manned to attack a port. Which has its own pros and cons.