- Virus hunters explore bat caves for signs of deadly diseases
- Diseases such as Ebola, Marburg and rabies can be carried by bats
- The goal is to identify potential outbreaks before they happen
(CNN)It is a slow and cumbersome descent hindered by head-to-toe protective suits. A wooden ladder dips down the side, as two researchers in white suits and respirators make their way into Grootboom cave in South Africa.
Go to CNN.com/unseenenemy for more stories and resources about epidemics, pandemics and the CNN Films documentary, "Unseen Enemy."