more in depth system

health system: limb-based, like in tarkov or the minecraft mod “first aid”
different limbs have different effects and must have items used on them separately
bleeding maybe, also?
oxygen system: classic but with 3 new things added

1. decompression sickness: the oxygen display will flash red when this happens, and if you dont stop, you will take damage to the head, amount of damage depends how fast you ascended
2. nitrogen narcosis, this will be an effect that accumulates very slowly, and only from a certain depth, it will accumulate faster the deeper the player is, tho. it will cause effects like trails in vision, input delays and even outright missing inputs, depends on how severe.
3. lung damage, when oxygen is released from the main bar, the lung oxygen bar is filled, this bar does nothing when youre just diving but when you need to ascend, if you ascend very fast and cover a lot of depth, your lungs will take damage, this can be prevented by pressing and holding T, however upon doing that you will be put in the no oxygen state and have 15 seconds, letting go will make the character breathe again.
   to make room the displays for these stats can be put in place on hunger and thirst which will move to the PDA as they dont require as much real time assesment.

these 2 are in 1 post, because they are intertwined.

these dont have to come in a single package, itd be fine if only some are implemented, or even only some parts of 1 of these, or spread accross difficulties/tweaks you can enable disable per save/server, as these arent very dependant on each other.

images have been included.