
If you want to quickly progress through Subnautica 2's story and collect resources much faster, you'll need to get your hands on a vehicle. The easiest one to make early on in the Tadpole, requiring you to get your hands on a power cell.
Before you can make a power cell, you'll need to acquire Necrolei Cysts so you can craft Strong Acid. It'll take some time, but once you know where to find them, they're hard to miss.