Crysis

In playing Crysis, I came across a few creepy disembodied voices with no apparent source that I could see. The first of these pops up just after you walk into the Korean camp in the "Left Behind" part of Relic. As you walk through the camp, after decimating all the enemies in the area, right around the GPS Jammer you'll hear somebody calling out. I have no clue what he's saying, or where the voice comes from. If anybody else has a clue, I'd love to know. The only thing I've thought of is that maybe it's a game designer's joke? Something that was supposed to have meaning but never given a purpose? I got nothin'.