For the third straight day, Ottawa police are resuming recovery efforts Monday on a submerged car found in the Ottawa River with one body inside.

Recovery efforts are set to resume at 1 p.m. local time Monday, after divers on the weekend entered the frigid waters near Fitzroy Harbour, located just west of Ottawa, to investigate a submerged vehicle.

The car’s licence plate matches one belonging to Donna Graves, who went missing Thursday night along with her son Daron. The pair were reported missing on Friday.

“There’s all kinds of debris floating around inside the car, and it’s impossible for us to tell exactly what’s in the car. So we can confirm that there’s one person inside, but we can’t confirm whether there is a second person or whether there isn’t,” said Ottawa Police Insp. Murray Knowles.

The vehicle, a 2013 Dodge Dart, matches the description of the one 61-year-old Graves and her 29-year-old son were last seen driving from Arnprior, a town nearly 70 kilometres west of Ottawa.

Poor visibility, shifting ice and frigid temperatures made recovery efforts difficult over the weekend. Police say the vehicle was on its roof under about 25 feet of water.

With a report from CTV Ottawa’s Claudia Cautillo