You have been exploring trough the Facility. It is run by scientists conducting experiments on various creatures. You are allready been chased by the guards, dogs etc. Until you reach to the underground area. This sector contains the artificial forest, the mines, and the shockwave atrium and is mostly submerged by water. In water you learned is a naked long haired girl that tries to brobablly kill you, so of course you avoid her It's possible that she was once experiments that successfully escaped.