User blog comment:Sandy the Shark/Questions./@comment-39518059-20200914114333

Use this walkthrough guide. https://gamefaqs.gamespot.com/pc/763304-subnautica/faqs/76398/the-guide.

More specifically, use your blueprints and find the materials to upgrade your depth module. Rubies are plentiful in the cave system associated with Lifepod 19. For the Prawn, you really need the  drill arm and grappling arms. Check wreckages in the Grand Reef, the area south of Floating Isle, and NW of Floating Isle for Prawn accessories.