@barnee
Originally the Super Heavy Battleship units had to be produced in a Capital (USA could also produce them in sz 10).
But during play testing we experienced that the production capacity of the Capitals were already under pressure due to the multiple units that can only be produced in a Capital.
This is true especially for Germany.
Nonetheless - our game experience shows that in more than 90 % of all games the Super Heavy Battleship units are produced in the sea zones mentioned above.
So, we decided to let each player decide where to produce the Super Heavy Battleship units.