'Ebb and Flow' does not take place in Greenland, but in the bay of Kangiqsujuaq in the far north of Canada. The story was too good not to include, though. In the coldest of winter, every two week the moon’s pull is so strong that the fjord drains underneath the ice. The ice then sits directly on the floor of the bay, and the locals climb down underneath the ice to collect blue mussels. They have to be quick and alert, because the tide returns fast.