W5 investigates the threat of asbestos cement pipes buried underground across Canada. These pipes, installed decades ago and all nearing end-of-life, were still not only in use but were also delivering tap water to Canadians. And as these pipes deteriorate and fail - they leach asbestos into the water. The science, however, on ingesting or drinking water with asbestos is still hotly contested. But there is a growing body of research that suggests ingesting these fibres could elevate the risk of stomach and other gastrointestinal-related cancers.