How do turtles survive when the pond is frozen?

how do they come up for air?
Answers:
turtles like alto of animals hibernate. water turtle bury themselves in the pond mud and through special skin on there rear side and around thier legs the can "breath" under water during hibernation and sleep.
because they are hibernating they do virtually nothing and there fore require very little oxygen.

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Turtles hibernate

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Water turtles bury themselves in the mud, during winter. When they go into hibernation, their heart rate slows way down and their other organs may shut down completely. So, they don't need oxygen, or not very much of it, to survive.

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Turtle is one example of an animal that can hibernate. Hibernation is a state of inactivity and metabolic depression in animals, characterized by lower body temperature, slower breathing, and lower metabolic rate. Hibernation conserves energy, especially during winter. Hibernation may last several days or weeks depending on species, ambient temperature, and time of year. The typical winter season for a hibernator is characterized by periods of hibernation interrupted by sporadic euthermic arousals wherein body temperature is restored to typical values. Hibernation allows animals to conserve energy during the winter when food is short. During hibernation, animals drastically lower their metabolism so as to tap energy reserves stored as body fat at a slower rate.

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They go into hibernation and don't need to eat or come up for air. Their respiratory system slows down enough and they can survive without all of this.