Things like building the ship on Earth or sending it underwater at most involve a significant evolution (or deterioration, if you don't like it) of the way a lot of us thought about the Enterprise and about space travel in general in the 1960s and 70s or even at the time TNG was introduced. The fictional narrative about these ships in Star Trek has "powered them up" considerably over time, and all of this can now be justified by various technobabble statements that have been made onscreen and incidents we've been shown over the years.
Even Superman couldn't fly, at first.
Even Superman couldn't fly, at first.