Racing Against the Tide In the freezing depths of Canada

In the freezing depths of Canada there's a tribe that go 'fishing' under the ice. The tribe is from Kangiqsujuaq in Canada. They are going a great length to catch fish from under the iced sea during the extreme tides of spring equinox to gather mussels.

It's really a race against the time. They have less than half an hour to search about these temporary caverns before the tide rushes back in. 

There's always an out watcher to look-out for the returning tide, but the warning shouts can't be too loud in case the echoes bring down the ice.