The woman, who was from Missoula, was part of a six-person group that went scuba diving at Lake McDonald around 4 p.m. that day. She was declared dead after first responders and other divers in her group were unable to resuscitate her, according to the release.
It’s not clear how the accident happened. Bystanders drove to a lodge for cell signal to call 911, and first responders arrived about 30 minutes later, NPS said.
Authorities are investigating the incident, and park officials did not release the names of the victims.
Lake McDonald, with its crystal-clear waters, is a popular scuba diving destination because of an underwater forest and the submerged relics that lie beneath its surface. Divers in Glacier National Park aren’t required to have permits, and their equipment isn’t subject to official inspections, according to the NPS.