火山失落之地:--
在新几内亚，组建了两支队伍，其中一支进入博萨维火山口。这座死火山是从空中拍摄的，因为直升机将一支先遣队带到了它的边缘，他们已经安排在那里会见当地的科苏阿人，他们将成为他们的向导。他们爬下火山口，为团队的其他成员准备大本营。 Buchanan 拍摄了一只树袋鼠，Helgen 帮助识别了一只小袋鼠、一只彩绘的环尾负鼠、一个新的 cuscus 亚种（类似于柔滑的 cuscus），以及一种临时命名为 Bosavi 长毛鼠的大型新鼠种。
McGavin 率领另一支队伍前往新不列颠的活火山 Tavurvur。他看到一只婆罗门风筝在灰烬覆盖的土地上狩猎，并在树桩中发现了一只成年犀牛甲虫和一只幼虫。他看到巨型鸟类在温暖的灰烬中挖掘鸡蛋，当它们完成后，他发现并重新埋葬了一个大的椭圆形鸡蛋。在壮观的火山活动迫使团队撤离该地区之前，他发现了清道夫蟹。此后，麦加文前往新几内亚，一架直升机将他带到博萨维山的边缘。当他观看一只华丽的果鸽时，他报告了气候变暖和人类对野生动物的危险。他设置了一盏夜灯，吸引了数百只飞蛾，他怀疑许多飞蛾不为科学所知。当直升机抵达将他从山顶接走时，他想知道热带雨林及其生物多样性是否会被破坏。
Lost Land of the Volcano:--
On New Guinea, two teams are formed, one of which goes into the Mount Bosavi caldera. The extinct volcano is filmed from the air as the helicopter takes an advance team onto its rim, where they have arranged to meet local Kosua people who will be their guides. They climb down into the volcano crater and prepare a base-camp for the rest of the team. Buchanan films a tree kangaroo, and Helgen helps to identify a wallaby, a painted ringtail possum, a new cuscus subspecies (similar to the silky cuscus), and a large new rat species provisionally named the Bosavi woolly rat.
McGavin heads the other team and goes to Tavurvur, an active volcano on New Britain. He sees a brahminy kite hunting over the grey ash-covered landscape, and finds an adult rhinoceros beetle and one of the larva in a tree stump. He sees megapode birds digging in the warm ash to bury eggs, and when they have finished he uncovers and reburies a large oval egg. He finds scavenger crabs before spectacular volcanic activity forces the team to evacuate the area. After this, McGavin goes to New Guinea and a helicopter takes him to the rim of Mount Bosavi. He reports on the dangers of climate warming and of humans to the wildlife as he watches an ornate fruit-dove. He sets up a night-light which attracts hundreds of moths, and he suspects many are not known to science. As the helicopter arrives to collect him from the summit, he wonders if the rainforest and its biodiversity will be destroyed.