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Dead pools: Intruders will be killed on entry

Brine pools are hypersaline and will kill (or at least stun) most organisms that enter them.

Brine pools are one of the most extreme environments on Earth, yet despite their high salinity, exotic chemistry, and complete lack of oxygen, these pools are teeming with life
Brine pools are one of the most extreme environments on Earth, yet despite their high salinity, exotic chemistry, and complete lack of oxygen, these pools are teeming with life / Credit: NEOM