lake in the world. large enough to float these massive ocean vessels. but gatun lake serves another purpose- supplying 80% of the fresh water to the people of panama. and that's why we're at the lake this morning. ariel rodriguez is a biologist from the university of panama. he's taking us on a tour of gatun lake, but this tour isn't of the usual sites. it wasn't long before we found what we were looking for. >> behind me that pump is for water but it's out of the water, that doesn't look normal. >> no, of course it's not normal. >> sadly the pump is just the beginning. rodriguez told us to head out onto to the lake and we'd see what has many in panama worried. our boat is a small one, less than 25 feet. tiny on a lake the size of gatun, and no match for traffic. >> wow that's big. >> it's just after noon in the panama canal and that means it's rush hour we've got a container ship going that way, and this big blue one here that is the biggest size of ship that the panama canal right now can handle. >> this is the glovis clipper, a 58-thousand ton vessel. 50 mega-

we're here in gatun lake, and this ship is actually going thru the panama canal heading towards believer described the concept and approach to the world, a geo political system where people's could follow living and a world where people can live together and a world of peace and justice, this is a political approach that rejects every kind of this that rejects the threat and use of force which rejects economic domination. and this year we are also marking t marking the 70th anniversary of the founding of the united nations and 70 years have passed as in a flash. 70 years while we searched. to find a way of settling our relationships so that we could build up a world which would be fit for everybody, a world of inclusiveness without any kind of discrimination, 70 years, 70 years for a united system and this is indeed a victory for the human race. and 75 years ago the charter of the united nations was elaborated after the end of that tragedy, the second world war. and with their memories still fresh, full of the horrors of the second world war, which led to the life of -- to the death of s