Hundreds of miles of ice dome? Sounds kinda not believable to me.
Several, not hundreds.
(snip)
This is a schematic diagram indicating the approximate scale of one of the ice shelf channels, similar in height to the Eiffel Tower, and Tower Bridge in width. Credit: Anne Le Brocq
http://phys.org/news/2013-10-giant-channels-beneath-antarctic-ice.html