This is connected with the Hazard level of the planet.
Once the life support depletes entirely, you will lose all your shields and will start losing health.
If you fail to find a place where you might replenish life support, your character will eventually die.
Hazards have a different impact on the life support system.
Level of hazards can be decreased by increasing the viability of the planet.
Each point of planet viability will have a positive impact on it.
However, finding, clearing and activating a Remnant Vault has the highest influence.
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