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Mountain rescuers carry cave researcher Johann Westhauser , center, to a helicopter outside the Riesending cave near Marktschellenberg, southern Germany, Thursday June 19, 2014. The German cave researcher has been successfully brought to the surface after suffering head injuries in an accident deep underground nearly two weeks ago. Westhauser was injured June 8 while nearly 1,000 meters (3,280 feet) underground in the Riesending cave system in the Alps near the Austrian border. (AP Photo/dpa,Nicolas Armer)

BERLIN (AP) — Doctors say they're satisfied with the condition of a cave researcher hauled out of Germany's deepest cavern after sustaining head injuries, though he will need a few months to recover fully.

Johann Westhauser was flown to the Murnau Trauma Center following his rescue from the Riesending cave Thursday, nearly two weeks after being hit by a falling rock.

Doctors said Friday the 52-year-old sustained skull and eye socket fractures, and some internal bleeding. In a video shown at a news conference Friday, Westhauser appeared to have some difficulty speaking but the hospital said he won't need neurological surgery.

Medical director Volker Buehren said Westhauser likely will stay two to four weeks at the clinic, then will need further therapy — with the healing process lasting three to six months.