it's known as anak krakatoa, child of krakatoa becaucrack tk.e of the island since the large eruption back in december and you can see three quarters of this island blown to bits. >> the top blew off or something? >> everything. it was a massive eruption. the island then collapsed into this now-crater of steaming water and that reddish stain that is now in and around those blue waters is from acid and iron that has now since been released into the ocean around it. >> the before-and-after pictures give you an understanding of how tsunamis happen and how they can be so powerful and damaging. >> it was a jungle island and now you can see pretty much all life has been erased from this island. what trees are left are covered in a thick layer of ash and dust. this small island in the nation of indonesia is between java and sumatra and who knows? it may once rise again so to speak. it's incredible to see this aerial footage of the aftermath. >> this is nucleus of our existence so we're at the mercy of these volcanos and their activity. they decide when