Dear WW: Water has many marvelous properties. You must have heard that skating is made possible by the fact that a lot of pressure over a small area covers the ice into a film of water that lubricates the movement of the skate runner. That plane Glacier Girl sank two hundred and fifty feet into Greenland ice in fifty years. And its area was so large that the pressure per square inch would have been far smaller than that under a skate runner. I would have expected ice to crush it to junk. Amazing that the ice must have filled up the inside fast enough to prevent crushing.