The launch codes

literally nothing else

First things first go to Giant's Deep. Find an island that's imminent to being flung into space by a cyclone, park your ship on it and ride that ♥♥♥♥♥ like a cowboy because as soon as you reach space on that island you wanna get your ship on the furthest point the island reaches down, now make sure you DON'T get off of that point because you will mess this up if you do. As the island comes crashing back down into Giant's Deep you'll be flung fast enough into the core that you'll go right through it.

Congrations, you done it.

Now do the funny and get to the INNER core of Giant's Deep for some sweet sweet KNOWLEDGE

Here's a video guide if you need a visual aid.

Thanks to Roomba of Doomba for teaching me how to do this ♥♥♥♥♥♥♥♥