A man was in critical condition after he was found floating face down in Nuuanu Stream in Chinatown.

Honolulu fire Capt. Carlton Yamada said firefighters were dispatched about 3:30 p.m. Saturday after a bystander noticed the man in the water and entered the stream to keep the man’s head above water until emergency responders could arrive.

He said firefighters entered the stream near River and Pauahi streets, brought the man up a ladder, and turned him over to paramedics. The man, who appeared to be in his 50s, had a pulse, but was not breathing, he said.

An Emergency Medical Services supervisor said the man was taken to the hospital in critical condition.

Yamada there were no witnesses present who saw how the man ended up in the water. He was apparently in a deep part of the stream, away from the wall.