As summer sun melts ice atop the [Tana Glacier], rivulets disappear into surface holes. In time trickle becomes torrent, and a hole widens to a moulin, a gaping cave that plunges into the bowels of the ice—likely more than a thousand feet [305 meters] in this case.
(Text and photograph from "Alaska's Sky-High Wilderness," May 1994, National Geographic magazine)
George F. Mobley
