This picture taken on March 28, 2016 shows a general view at a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows an Indonesian man working on the demolition site of a house after the owner received compensation from oil and gas company PT Lapindo Brantas, who was drilling in the area at the time of the 2006 mud eruption, near a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows statues standing semi-submerged in mud, a symbol of the human toll of the 2006 disaster, at a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows an Indonesian man working at a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows an Indonesian worker watching as colleagues demolish homes after the owners received compensation from oil and gas company PT Lapindo Brantas, who was drilling in the area at the time of the 2006 mud eruption, near a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows Indonesian man Supriyadi, alias Cak Gondrong, standing in an abandoned house where he is living near a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows a height indicator (metres) placed at a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images

This picture taken on March 28, 2016 shows a height indicator (metres) placed at a mud volcano area in Sidoarjo, East Java. A mud volcano that erupted in central Indonesia a decade ago and swallowed entire villages is still oozing its all-consuming sludge, but for some entrepreneurial locals it has provided an unlikely business opportunity. "Mud tourism" is booming, as visitors flock to see rooftops poking above the giant bubbling lake, life-size statues made of mud and haunting memorials to one of the countrys worst environmental disasters. / AFP PHOTO / ADEK BERRY / To go with AFP story 'Indonesia-science-mud-volcano-tourism',FEATURE by Nick PerryADEK BERRY/AFP/Getty Images