A man is presumed dead Tuesday morning, after both official rescuers and an imperiled good Samaritan tried and failed to pull him from the surf off San Francisco's Baker Beach.

Bay City News reports that rescue crews were called to Baker Beach at 6:50 p.m. Monday on reports of "a person screaming for help."

When crews arrived, they discovered a 22-year-old man in the water, who "said he was attempting to help another man who was stuck at rocks below the cliff."

Rescuers pulled the first man from the waves with rope. The second man, who the San Francisco Fire Department says via tweet appeared not to be breathing, remained in the water

Struggle as they might, SFFD spokesperson Lieutenant Jonathan Baxter said at a media briefing Monday that "strong surf and strong undertow conditions" kept crews from getting near the second man, and at 7:50 he was submerged from view.

According to NBC Bay Area, crews continued to search for the man in the water until 11 p.m. Monday, but were unable to find him.

The 22-year-old who was rescued did not know the second man, Baxter says, and was apparently just a good Samaritan attempting to save the victim. He was not injuried in the incident, Baxter says.

According to Baxter, tide patterns off the San Francisco coast mean it's unlikely the body will be immediately found, as remains "normally take about two weeks to emerge from the ocean, if at all." As of Tuesday morning, officials did not have any public information to provide on the identity of the deceased.

Related: High Tides Strand Early-Morning Climber On Rock Face Near Sea Cliff