learn some simple physics before you post and expose the magnitude of the cavity between your earlobes.

Consider your domestic freezer...

If you put a loaf of bread, or a T-bone steak or whatever into the freezer and leave it for 2 or 3 years, it dries up. meanwhile, frost accumulates on the freezer elements and in a domestic environment this is a nuisance that needs to be chipped or scraped off, or even defrosted. H2O is moving, in vapour form (or vapor in the USA), from warmer regions to colder regions.

On Mars, Hellas basin is just such a warmer region, and the polecaps are a cold region.

Where do we find an accumulation of ice? - in the polecaps.

What is Hellas like? - Desiccated.

End of Lesson

No amount of moronic parroting of abstracts and extracts will guve your fuddled thoughts any credibility.

The Universe is, and does as it wants, not as you or I want. Our job is to learn this before ignorance kills us.