A University of Connecticut student nearly drowned in a YMCA pool in Stamford Friday, police say.

Doctors at Stamford Hospital fought to save the 20-year-old man's life when he arrived in the afternoon, according to investigators.

The victim and his friend were swimming around 4 p.m. The UConn student sank to the bottom, and his friend alerted a lifeguard.

Rescuers pulled him from the water and performed CPR.

Hours later, police said it was still unclear how severe the victim's condition was.

"They haven't given any indication at this point," said Lt. Gene Dohmann, of the Stamford Police Department. "But they're still working on him which is favorable. That's a good sign."

The YMCA says it closed its pool until further notice.

The pool is located next door to the UConn-Stamford campus.

This past summer, a 5-year-old boy nearly drowned in a Chelsea Piers pool, where he went underwater for almost four minutes. Police say they don't know how long the Stamford man was underwater, but in both cases, lifeguards were present.