The "Super Kalvari"
They sure aim high. This thing is pretty much inline with Korean Dosan chang anho class. Except apparently with French AIP. There seems to be only LOX tank in the hull, the hydrogen for fuel cell is obtained via reforming process, which basically boiling the diesel fuel and extract Hydrogen from the steam and purify it before feeding it to the fuel cell. The remnants of the process are stored or ejected out via cosworth dilution system, which dilute the exhaust gas to seawater.
One potential problem i see is that the exhaust system requires that the pressure inside the submarine to be higher than the water pressure for the dilution process to work. This can constrain the design diving depth, if the external pressure become excessive the sea-water instead will attempt to force its way in, potentially damaging the system.