Provide the highlights for the following article:\n    (CNN) -- Muddy but unhurt, three University of Texas students emerged from a cramped cave complex in Austin, Texas, after a day-long search Sunday. A rescuer at the entrance to Airman's Cave in Austin, Texas, Sunday. NAME_1, an Austin Fire Department spokesman, said the students -- two women and one man -- were reported missing early Sunday after a trip into Airman's Cave, about four miles south of the university's campus. They were found about halfway down the 12,000-foot-long cave, which has few spaces big enough for an adult to stand upright and is explored primarily by experienced spelunkers. The students were located shortly before 5 p.m. (6 p.m. ET), about 30 hours after they entered. Their names were not released Sunday night. A friend called 911 to report them missing at 5 a.m. The group had told friends to call 911 if they were not back by midnight Sunday, according to Austin-Travis County Emergency Medical Services. Earlier reports that four students were in the cave were incorrect, NAME_2 said. Authorities did not know Sunday evening why the students were in the cave for so long. But NAME_2 said it would have been easy even for experienced cavers to get lost in Airman's, which he compared to the roots of a tree. \"There are so many ways to go,\" he said. E-mail to a friend .\n    ", "article": "(CNN) -- Muddy but unhurt, three University of Texas students emerged from a cramped cave complex in Austin, Texas, after a day-long search Sunday. A rescuer at the entrance to Airman's Cave in Austin, Texas, Sunday. NAME_1, an Austin Fire Department spokesman, said the students -- two women and one man -- were reported missing early Sunday after a trip into Airman's Cave, about four miles south of the university's campus. They were found about halfway down the 12,000-foot-long cave, which has few spaces big enough for an adult to stand upright and is explored primarily by experienced spelunkers. The students were located shortly before 5 p.m. (6 p.m. ET), about 30 hours after they entered. Their names were not released Sunday night. A friend called 911 to report them missing at 5 a.m. The group had told friends to call 911 if they were not back by midnight Sunday, according to Austin-Travis County Emergency Medical Services. Earlier reports that four students were in the cave were incorrect, NAME_2 said. Authorities did not know Sunday evening why the students were in the cave for so long. But NAME_2 said it would have been easy even for experienced cavers to