sinkholes and their terrifying impact makossa, anyone? young musicians look for their lucky break in cameroon. and surveying in the savanna, saving congo's wildlife from extinction. it sounds like something from a horror movie. giant chasms which open up without warning, swallowing everything, and everyone, in their reach. unfortunately, these hidden monsters of the deep are all too real. they're called "sinkholes," and they occur all over the world. the 2010 guatemala city sinkhole, for example, opened up in the aftermath of a tropical storm, swallowing a three-story building and taking 15 people down with it. the same year in germany, a large crater opened up overnight pulling a nearby caller into its depths. in siberia sinkholes tend to be caused by melting pockets of subterranean gas. another place that is especially hard hit is the us state of florida, where experts say thousands of sinkholes form each year. we bring you this report. >> we're on the road from orlando to tampa, in central florida. the area draws tourists from around t

sinkholes and their terrifying impact makossa, anyone? young musicians look for their lucky break in cameroon.