The figure reported is misleading.
A$35B is the total budget allocated to the programme not just the build cost. Means it includes maintenance for 30 years of service life also.
Build cost is estimated at A$1.2B per hull inclusive of ToT
These 35 billion dollars are not Australian dollars they are us dollars. In Australian dollars the deal was 50billlion.
So A$4.2B per ssk. Or us $3 per ssk.
Secondly performance based maintenance is now part of all standard defense deals. If we get the ssk from France we'll also sign maintenance agreement and pay through our nose.
Scorpion costs us 0.5 B a piece when it's just 2ton small SSK.
Barracuda conventional version is more advanced and over 4ton . It cost Australia 38billion USD for 12 submarine including manufacturing and maintenance that's 3.2B USD per submarine!!
Since we are only buying 6 our deal will be more costly not cheaper. We can build nuclear submarine for less money . So no chance for barracuda in India.
Scorpion we already have . Amur is too small. Swedish and Spanish too unknown .
HDW and German track record of tech transfer ( south Korean successful adoption and subsequent exports.) Makes HDW most likely candidate.