( CNN ) -- A state medical examiner will try to determine the cause of death of two University of Florida students who died over the weekend while exploring a cave in northwest Georgia . Michael Pirie , 18 , and Grant Lockenbach , 20 , both died Saturday of what appears to be hypothermia , David Ashburn , director of Walker County emergency services , said late Sunday . Autopsies will be conducted , he said . `` Both passed away in Ellison 's Cave in Walker County and their bodies are at the state medical examiner 's office now , '' Ashburn said . `` We think Grant went down first and Michael went down to help him . '' Their bodies were removed from the cave late Saturday , he said . They were part of a group of five guys and five girls who were exploring the Crockford-Pigeon Mountain Wildlife Management Area in LaFayette , Ashburn said . Walker County Sheriff Steve Wilson said affiliate WTVC that Pirie and Lockenbach broke away from the group and decided to explore by themselves . `` They were only dressed in T-shirts and jogging shorts and certainly were not dressed appropriately for going in a cave , '' Wilson said . Other members of the group were able to communicate with the men for up to 45 minutes , but their voices eventually grew faint and disappeared . Lockenbach was president of the Fellowship of Christian Athletes , which held a prayer service for the two students Sunday night , the Orlando Sentinel reported . Pirie was also a member of FCA and played in the University of Florida Drumline .
The bodies of the students are recovered over the weekend . This appears to be the cause of death . Note : Both men were members of Fellowship of Christian Athletes .