electrocuted three condors. kelly tracks the birds at big sur. >> it's nearly impossible to see until it's too late. >> reporter: the utility took them down and they brought in underground piping and buried the wires. the total cost-- $4.2 million. according to the federal government, it's the largest project launched to protect an endangered species. >> i think we can agree to have our children see the condor in the wild is a great thing. we want to get the population up as fast as we can. >> reporter: now, there is one less obstacle in the way. >> axelrod: still ahead, saving children one drop of water at a time.