The fragments can be found in the Kelp Forest and in Safe Shallows. While wearing Swim Charge Fins, as long as the player remains moving the Seaglide will slowly gain charge rather than losing it, allowing for effectively infinite use.
0:051:34Subnautica | How to get the Seaglide guide 2018 - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou need a battery lubricant a copper wire and the piece of titanium. And then you bring it to theMoreYou need a battery lubricant a copper wire and the piece of titanium. And then you bring it to the fabricator.
Look Ultra Instinct is the league of Hakaishin and transcends beyond SSJ. And it is not possible to stack Super Saiyan while Ultra Instinct because Ultra Instinct is calm state and stacking Super Saiyan contains rage. So Goku can't stack SSJ with UI.
Trunks achieved the Rage form when he realized that his world was doomed, that Goku Black and Zamasu were impossibly stronger than him. At that moment, he was overcome by anger, or rage (hence the name) and he was somehow able to combine that rage with the Super Saiyan transformation.