How to get a tadpole submarine in Subnautica 2
via polygon.com
Short excerpt below. Read at the original source.
Crafting a tadpole in Subnautica 2 involves a somewhat tedious search for submarine fragments and a moonpool blueprint. Without those items, you won’t unlock the tadpole crafting recipe. It’s important to craft this mini-submarine as soon as possible though, as it’s the only way to explore the deepest parts of the ocean planet.