Well first off has it exploded yet?

Yes! i got radiation suit, the seamoth, the seaglide, flashlight, and survival knife, and fins

But idk how to get in

Well go to the exploded bit then there should be a platform you can walk on you may need a propulsion cannon as well

You mean the front? doesn't that have reaper leviathans?

Yes but if your careful you should be able to avoid them

Ahhh wait i just looked at the page for them, if you stay on the surface and move with a seaglide instead of a seamoth or something it will be let detective so uhm yeah also i might save in a base first