Are you referring to hydrogen fuel cell propulsion?
Fuel cell development is not new development in ST, round abt
3-4yrs ago I found from internet digging that ST already has
production facilities to build fuel cell engines for buses over in
china and they do today have hydrogen fuel cell buses running on
roads in china manufactured by ST.
I also heard that ST sometime back bought a small company in US
doing some kind of portable fuel cell storage for providing
electricity to homes and small buildings, but that company was
later bought over by another company, not sure if ST still has a
share holding.
So you see hydrogen fuel cell development is not new thing for us.
But I guess when you talk abt submarines propulsion now that is
something which any government will jealously guard even from
Allies.
If we count on our own engineers, my guess is it will take years I
guess if we want this thing from them we have to give something in
return which far exceeds the value of which we want. And even if we
do get some collaboration it wouldn't be much, just enough for our
engineers to get off starting point in the right direction.
But anyway whether or not hydrogen propulsion for submarines will
turn out to be a blessing or hazard in real life situation is
anybody's guess.