That increases the salinity of nearby water, which in turn lowers its freezing point, so that it stays liquid even though it's really, really cold. (In a way, this is the opposite of the reverse osmosis process that desalination plants use to turn seawater into drinking water.) Pockets of that brine can get trapped inside the ice pack.If the ice pack cracks, though, something bizarre can happen to those pockets. The freed brine will leak out and, because it's denser than water, it will sink downward toward the ocean bottom.
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