nbc chief foreign continue richard engel recently travelled to tanzania where a controversial projectarms. >> it is an important story and conservationists are very worried about it. the environmentalists say they know exactly what the impact will be if the government of tanzania goes ahead with its plan to build a road right through the sarangetti. the name means endless plains and it's no wonder why. the 5,700 square mile national park in northern tanzania is widely believed to be one of the only remaining place where is the world looks as it did a million years ago. with two ton hippos yawning confidently, too big for any predators. grateful giraffes, zebras with their plump bellies, and lions, the kings as they're called here. but this eden of biovdiversity s in danger. conservationists say the road which has strong political support in this poor country is a scandalously bad idea. we set off in a four by four jeep on the trails and dirt roads that could soon become a 33-mile, two-lane highway. our first impression, zebras, wildebeests and others -- >> now there's just a few trail