Yes I expect they started digging those missile bunkers 2000 years ago knowing that one day someone, somewhere, would invent something they could launch at passing ships.
Huh. They didn't, but probably several decades ago.
Tell me, which American project took several decades to come to maturity? There has been none. Its focus and attention span isn't long. The next President cancels or doesn't follow up with what the previous President starts, which effects a limit of eight years to any project. There is zero civilizational thinking.