1 hour ago, GreenDragoon said:No I am certainly no Thrawn, but using your hidden planet to assemble a huge fleet of Star Destroyers, all underground , while also developping new tech for the cannon with out getting noticed by anyone? Really? All the transports that have to go through this weird thing (a wormhole?) to get there and nobody ever noticed? Or is there a normal way instead? That again nobody noticed.
The dark side of the Force is a pathway to many plot points some consider to be "unnatural."
I'm sure an explanation of "how" will be given in some other material. I personally don't think the movie needed to take more time to explain how the fleet came to exist, especially when it was already jam-packed with tons of other explanations for stuff. The fleet was a threat, and that's all that mattered.