Would a species evolved for very high environmental pressure necessarily die in lower pressures?

I'm aware that deep sea fish don't actually "explode" when brought to the surface but any air sacs in their bodies would expand and cause them possibly fatal damage.

However, what other physiological problems might occur in a creature that had evolved in an environment of extremely high pressure when moved to a low pressure environment?

I'm trying to think of what "survival gear" would be required for a being used to living in pressures in the hundreds of MPa range to be kept alive at the Earth's surface.

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Would a species evolved for very high environmental pressure necessarily die in lower pressures?

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