. >> rogelio nunez is our captain. he is a man who knows this lake, and knows what's happening isn't normal. >> what is it normally like in the rainy season? >> in the rainy season it rains every day now we go for weeks without a drop of rain. >> does it concern you? >> we are very worried, not only me, everyone in panama is very concerned. so you depend on water for your livelihood. >> that's right. panama depends on water. >> and with that, nunez and his crew steered us deeper into lake gatun. it wasn't long before we reached the spot everyone was talking about. >> so you can see the height of the rust that's how the water normally is right now during the rainy season, but the waters are so low, you can see the top of the tree trunk, and this isn't the only one. they stand like ghosts suddenly caught in the harsh hard light of day. acres of what was once a living forest now exposed for the first time in one hundred years. >> this is the first time that wherever you go you find all these tree trunks that supposedly ha