Marin County officials have identified one of two men found dead in Tomales Bay after a canoe trip, the Marin County Sheriff's Office announced Monday, Aug. 31.

The second man has not been identified.

Casey Flynn Melia, 36, of San Francisco, and a companion left a campsite on Tomales Bay by canoe just prior to midnight Saturday, Aug. 29, according to the Sheriff's Office. The pair had planned to camp at White Gulch Beach, an inlet on the western side of Tomales Bay within Point Reyes National Seashore, to view bioluminescence, CBS News reported. When the two did not return the next morning, members of their camping party called 911, and first responders began a search-and-rescue operation, according to the Sheriff's Office.

The Marin County Fire Department received a call at 10:39 a.m. Sunday, according to the Marin Independent Journal. The fire department then contacted the U.S. Coast Guard, which began searching after 11 a.m., according to Coast Guard spokesperson Richard Uranga. The Coast Guard deployed a small boat from its Bodega Bay station, and Marin and Sonoma county fire departments joined the search alongside the National Park Service.

Search teams found one man unresponsive in the water near Toms Point, according to the Marin Independent Journal. The Coast Guard transported him to Bodega Bay in Sonoma County, where he was declared dead, according to the Sheriff's Office. The Sonoma County Sheriff-Coroner Bureau is leading the investigation into his death.

Search teams located Melia a short time later, unresponsive near Hog Island. He was recovered by the National Park Service and brought to Sacramento Landing, where he was pronounced dead, according to the Sheriff's Office. Both men were found wearing life vests, according to the Marin County Fire Department.

A forensic post-mortem examination and toxicology testing for Melia are scheduled for later this week. The official cause and manner of his death remain pending a joint investigation by the Marin County Sheriff's Office, the Coast Guard and the National Park Service, according to the Sheriff's Office.

Bioluminescence in Tomales Bay is caused by tiny organisms called dinoflagellates that emit flashes of light when agitated, according to the San Francisco Chronicle. The phenomenon draws visitors to the water between June and October.