Brave kayaker Ben Marr goes with the flow as he paddles down a drainage ditch in Canada reaching speeds of over 30 miles per hour. The terrifying helmet camera footage shows the canoe sliding along a trickle of water and grinding against the concrete drainage structure as it heads towards a reservoir near Vancouver. Ben Marr can be heard shouting and screaming throughout the speedy 90-second journey as he battles to keep the boat upright.