It's interesting that on and off the "internets," there is so much controversy as to weather a star ship can go underwater. In the Voyager Episode Thirty Days, Paris takes the Delta Flyer underwater for a protracted period of time. So why couldn't another ship also go underwater?
There might be a difference between a Delta Flyer and a big starship.
Yes there is.
The starhip has more powerful shields & hull structure, so it's even easier to withstand the underwater pressure.
But this is "a starship built on the ground???" 2.0, and the suggested solution there has been "it's on screen, it's canon, shut the fuck up". So I know already how this debate will end.
Actually, there have been plenty of solutions & explanations given over the years by people here, you just chose to conveniently ignore them. So we already know how this new debate will end too.