A doctor has said the rescue of a severely injured man, trapped in Germany's deepest cave, "won't be easy."
Doctor Christoph Specht told news channel NTV: "The conditions are extremely narrow.
"There are only a few people in Germany who know how to handle such a rescue."
The cave on the border of Austria, has only been explored by researchers since 2002, is more than 19km long and up to 1.15km deep.
The 52-year-old cave explorer, named by local media as Johann Westhauser, is trapped in the cave at a depth of 1,000 metres.
A US scientist and geography professor was scouting a route alone on Monday along Mount Himlung in Nepal, before falling 70ft into a Himalayan crevasse and breaking many bones in the process.
John All recorded what he believed to be his final messages to his families, explaining what had happened to him. Except in this case, he survived to tell the tale.
ITV News correspondent Paul Davies reports: