Carbon monoxide questioned in Calgarian's diving death

A dive instructor in Alberta says people should wait for the facts to be established before blaming anyone in a Calgary woman's death in Mexico. 

Ronda Cross was diving with her cousin and a certified dive master near Cabo San Lucas when she failed to surface last Saturday.

Her body was found by a nearby diving boat.

Cross's cousin Roxanne Amundson and other family members blame the company that filled the tanks, Sunshine Dive and Charter — a five-star Professional Association of Diving Instructors (PADI) member.

"That’s what we believed, she just passed out under the water. It’s like sitting in the car with the exhaust running, you don't even know until it’s too late," she said.

Amundson said it was a bad experience from the start, and even dive master Jorge Duchateau said he started feeling sick about 15 minutes into the dive.

Carbon monoxide theory questioned

Grant Stephanson runs his own five-star PADI dive shop in Edmonton.

He says a PADI certified shop has to meet certain standards and air compressors are tested on a regular basis.

"You have to show them that your air is checked on a regular basis, at least twice a year, and you know that it’s of good quality," said Stephanson.

Stephanson questions allegations that diver Ronda Cross died from carbon monoxide poisoning.

He says five-star facilities are busy and they fill hundreds of tanks a day, and the chances that only three were contaminated seems extremely unlikely.

Meanwhile, the company that's being linked to the investigation, Sunshine Dive and Charter, denies any involvement. The manager says Sunshine did not fill the tanks.