mckey is ceo of the renewal corp. ration. recently blasted a hole in one of the largest dams, setting it free for the first time in more than 100 years. all four dams are being torn down. the reservoirs drained. the klamath left to run wild. they were producing so little power it no longer made financial sense to continue operating. >> every bit of this will be completely gone. >> how big of a project is this? >> it may be the largest ever undertaken. >> it was once the third most productive river on the west coast. they decimated populations. they became endangered species. the warm water turned into a toxic stew. >> did we not know or did we not care? >> the manager noted that the impact was real. >> they would have known had they asked us. >> over the years, tribes clashed with federal agents. the tried to enforce the ban on fishing what was left in the river. then in 2002, the government diverted water, leading to a die off of 70,000 salmon. the tribes had seen enough. they protested the companies , demanding they be remo