In terms of complexity, it was the equivalent of a rescue mission from Mount Everest.

A cave researcher is close to seeing the light of day again after suffering head injuries in an accident deep underground in Germany nearly two weeks ago.

An injured researcher stuck deep inside an Alpine cave in Germany is able to walk with help, but an operation to bring him out could still take several days, mountain rescue officials said.

Rescuers were working to rescue a man stuck deep inside a cave in the German Alps after he was injured by falling rocks, an effort that police said could take days as experts negotiate a tricky labyrinth of vertical shafts and bottlenecks.

Rescuers are working to recover a man stuck deep inside a cave in the German Alps after he was injured by falling rocks.