Two men died in an underground telecommunications tunnel, apparently because of a lack of oxygen. The men had descended about 12 feet into a Bell Canada cable vault to perform maintenance in the tunnel, which holds telecommunications wiring.
When a supervisor called down and got no response, he called 911. Once firefighters arrived, they had to put on air tanks to enter the vault. They found the two workers who "were overcome, likely by a deficiency in oxygen" unconscious in a pool of water. The men were removed from the tunnel within 10 minutes, but they had no vital signs, and were pronounced dead at a hospital.
Police said both men had worked in the industry for many years, and were employees of a subcontractor for Bell Canada.
A Police spokesman said the investigation will take some time because the air quality tested at the site was "not safe for [investigators] to go below the surface." (info from Toronto Globe and Mail)