An experienced diver is the second person to drown in two months at Flintkote Quarry, which attracts hundreds of scuba divers every year.
Province police retrieved the 47-year-old diver's lifeless body Saturday morning.
They attempted to revive him, but the man was pronounced dead at hospital, police said.
The diver, who was with a partner, apparently felt faint when he was 44 feet deep.
He took off his equipment and tried to return to the surface, said Guylaine Cloutier, who is responsible for the diving site.
Cloutier said the diver was a regular at the site and in excellent shape.
"He always checked his equipment and things many times.
We can't do anything about feeling faint," Cloutier explained, visibly shaken by the death.
Although she says the site is safe, Cloutier is concerned that this is the second drowning in two months and the fourth in five years.
"I've been caring for the site for 15 years but in the last five years, I don't know what's been going on.
There is always somebody who feels faintness and stays down there.
This is my fourth ... it looks like they are all in the same age bracket," Cloutier said.
Another diver, a 49-year-old man, died at the location in May.