18,000 still trapped in Canada's massive flooding

About 18,000 people are still trapped by the massive flooding that has wracked parts of Canada, cutting off access to entire towns and even in remote mountainous areas, in what some are fearing may amount to the most expensive disaster in the country's history.

And a warning sign over how fragile Canada's supply chain really is.

Some roads in British Columbia are completely swept away.

Rivers are choked but water levels are starting to go down.

It's on these rivers that we found Brandyn Desjarlais and his volunteer boat crew, normally sport fishermen, doing their part to help their neighbors:

"Today, we are out here, we're shuttling people from Mission, B.C. to Chilliwack, B.C., and back and forth. The highways are still closed or partially closed. So, the only way out is by water so, us and a bunch of other guides are out and are getting people where they need to be."

Meanwhile the seaport in the city of Vancouver remains cut off from these areas, which are seeing panic buying and fuel shortages, although the government is assuring residents that the food supply is secure.

Canada has few main arteries for highways and rail links, so one storm was able to cut off this much in just a matter of hours.

Wildfires over the summer may have also left some hills without vegetation, which would have contributed to the flooding and mudslides.

More heavy rain is forecast in the coming days.

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