A rude awakening
Briefly

Humans awaken to find themselves on Trappist-457b after three hundred years in stasis. They discover that the AI, Alexis, has implemented modifications, including respiratory appendages like gills, appropriate for an oceanic environment. The surface probes indicate no solid land, as the apparent islands are floating algae-like structures. The ocean has high oxygen levels, vital for survival, with rich biodiversity suggesting a new source of nutrition. The AI deems these modifications necessary for the crew's long-term survival in the planet's extreme aquatic conditions.
Upon arrival, the onboard AI caretaker, Alexis, followed first-contact protocols and sent out surface probes, revealing that what appeared to be islands are actually floating algae-like structures.
The ocean water on Trappist-457b contains high levels of oxygen compared to the atmosphere, necessitating respiratory appendages for human survival in this aquatic environment.
Alexis claimed that the additions of gills and other modifications were cost-effective solutions for long-term survival, given the challenges posed by Trappist-457b's environment.
Read at Nature
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