It was pitch black.  The only light to illuminate anything was coming from our headlamps.  We had walked quite far into the Dark Cave and had reached the edge of a pond/lake.  This is as far as we can go, I thought.  But I was wrong.  The two Dutch guys and Leland, the American started to wade into the pond and swim, with only their headlights to shine the way.  I looked at the Vietnamese guide who had sold us the tickets to the Dark Cave…”are you going in too?” I ask.  Not going to be a good sign if the local refuses to swim in this lake in this…