DeathRun - Roguelike Super-Hard

(EDIT: Deathrun has been REMADE for the latest version of Subnautica, so if you landed here and it isn't 2022 any more you probably want to go to: https://www.nexusmods.com/subnautica/mods/1495 -- Thanks for all the fish, Cattlesquat!)

Subnautica as a very difficult "Roguelike"

I loved my first playthrough of Subnautica! But then I started a second playthrough and found it suddenly too easy. So... I decided to make a mod that added all the crazy hard stuff that I loved from "roguelike" games, and this Death Run mod is the result of my efforts. On any particular playthrough of a Roguelike, you're so unlikely to survive and "win" that it's actually more of a question how long can you survive before your near-inevitable death! Therefore I have also created a death timer so that you can memorialize your glorious deaths and how long you survived before each. If you want to be surprised, skip the rules section below and just dive right in! (See what I did there?) Otherwise, read on and be dismayed!

Here are the main rules:

Life Pod Flotation Failure: your Life Pod will sink to the bottom, and will hopefully land at an extremely awkward angle! You will have to adapt to it! It will "right itself" to a more normal angle when you repair its secondary systems (but it will stay sunk).

Surface Air is Unbreathable: you can't breathe the surface air, and can now asphyxiate on the surface! A floating pump, however, will sufficiently filter the air that you can breathe from the pipes.

Increased Damage: all damage sources will deal you substantially more damage than you have been used to. No more "love taps" from creatures and surviving a whole bunch of Reaper Bites.

Expensive Power Costs: power costs (especially for fabrication) have gone up substantially, and are further increased if you are in a radiated area. Exiting from the Seamoth and/or Prawn ALSO costs energy if done "at depth", except at Moon Bay and Cyclops. Power also charges/recharges much more slowly than it did before. The early game copper-based batteries hold less power and are not rechargeable - rechargeable lithium batteries come later.

Radiation: Speaking of radiation, there's a lot more of it, a la the Radiation Challenge mod. The surface and the entire upper level of the ocean will be filled with radiation once the Aurora explodes, and the Aurora's explosion is much more powerful (go deep!)

Aggressive Creatures: The ocean creatures will become increasingly a