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Why would you assume the ice isn't being squished/stretched as well?
It's a completely different scenario than on Earth. Also Europa has less gravity than our moon, even, and just 13% than Earth's gravity. Much less pull from below, much more pull from above. That super thick ice shell just might stay in place like a church dome, even if the water level comes and goes.
So as far as I know, and I am no expert to be clear, the whole reason Europa even has a liquid ocean under the ice is because of tidal heating. Where the moon itself is pushed and pulled, heating it up immensely because of the friction of that action. So there would be no "air pockets" as such, because the ice itself is the thing creating the ocean. And due to ice being less dense than water the ocean would actually be exerting pressure on the ice mantle, not the other way around. I think this is one of the driving forces of the cryovolcanism found on Europa.
Exactly. The crust would likely experience similar effects as the liquid beneath, probably fracturing into plates and moving on the tide. There is visual evidence of the surface expanding, contracting, and fracturing with tidal forces