Aquatic turtles have another brumination (hibernation) strategy. Since they breathe air, yet may get trapped under the ice for months at at time, they lower their metabolism plus have adaptations such as scavenging some oxygen from the water via rectal tissues as well as other chemical activity involving glucose and calcium.
https://www.pbs.org/newshour/science/the-secret-to-turtle-hi...
https://wildlifeinwinter.com/painted-turtle
I have one at home in constant warm water, yet she can see the sky and decides to bruminate on her own: every year around this time, she starts napping in her under water hide for days or weeks at a time.
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