Four 17-year-olds and an 18-year-old walked into the surf with their arms linked in Ocean Beach, Calif., on Saturday, but only three came out of the rough waters, reports SF Gate. The Coast Guard called off the search for the two missing boys at dark, after a search that CNN reports lasted four to five hours and covered 54 square miles. No further search is scheduled for Sunday, and the two teens are presumed drowned. "If they were big, strong guys with wet suits, maybe there's some hope there," one official tells CNN. "But this a difficult case." The missing boys were characterized as weak swimmers; the three who made it out of the water are hospitalized in stable condition. (More Ocean Beach stories.)