As Calgary continues to grieve the death of 11-year-old Parker, new details are emerging about the search and recovery efforts earlier this week. Three CFD specialty teams — aquatic, technical rescue and hazardous material — were involved in Wednesday's recovery, Calgary Fire Department spokesman Alex Kwan told Postmedia. "As you get below 19 per cent, that could be insufficient oxygen levels for a person to breathe," said Kwan. Advertisement AdvertisementAdvertisement AdvertisementFirst responders who took part in the efforts to find Parker are encouraged to seek support. Meanwhile, relatives of Parker's family have organized an online fundraiser as a response to community members asking for another way to help.