PSDiver.com

On the evening of August 12, 1998, Cst. Dave Nicholson was called to the Parkhill Dam in Cambridge to assist with the rescue of a boy who had disappeared under the water. Ten year old Mark Gage had been swimming in the area near the rear of the lowhead dam and had not been seen for over thirty minutes. Dave was part of the Underwater Search and Recovery team and together with Cst. Rob Sauve and Cst. Curtis Rutt began to search the area along the rear of the lowhead dam.
 
Dave became trapped in the same underwater sluice, it turned out, that Mark had been sucked into. Despite the frantic efforts of the rescue team and civilian bystanders, Dave could not be freed from the sluice. Nicholson became trapped in the rushing water of the Parkhill Dam while trying to rescue 12 year old Mark Gage who drowned while swimming in the river. When his body was found, his arms were still wrapped abound the child.