[Ernest_at_the_Beach]

Not sure where you are going with that....the Ice Sheet is not in water.

[Ernest_at_the_Beach]

More :

This radar image shows part of the East Antarctic ice sheet (top), a bulge of refrozen ice (center), and the profile of a mountain range buried deep below (outlined in red). Full story plus an interactive tool here

 

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[moehoward]

Correct. But the article apparently is referring to ice sheet over water...
"but water deep under the sheets"

[ReverendJames]

It’s an experiment. If the ice sheet melts in entirety nothing will happen. When the earth was formed, some water remained liquid and some froze. It’s the same amount of water in either case. The oceans will not rise, the glass will not overflow.