One theory of how this ice water could have been placed on Mercury is from comet residue. Mercury has a highly eccentric orbit and a long orbital period. Therefore at certain latitudes, an observer on the surface could watch the Sun rise, move directly overhead and stop, then retrograde back a bit. After retrograding, the Sun would then proceed back on its westward track. In addition, since Mercury has virtually no atmosphere to scatter light, the sky would be black, even though the Sun disk itself would be over twice as large as what we observe from the Earth.
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