How to get the depth module tadpole upgrade in Subnautica 2

Getting a depth module in Subnautica 2 increases your tadpole submarine's depth resistance and lets you explore further ...
Ars Technica

Getting modules to load on boot?

I run Debian testing, and I'm having trouble figuring out how to add modules to be auto-loaded on boot.<BR><BR>I read the manpage for modules.conf, and it says to use modutils to modify the file. I ...