Meet ‘Los Topos,’ Mexico’s legendary brigade now working in Venezuela

After Venezuela's deadly earthquakes, many international rescue teams have left as the window for finding survivors narrows. But Los Topos Aztecas - a Mexican legendary volunteer rescue brigade - says it is staying until no longer needed. Born after Mexico City's 1985 earthquake, the group is known for crawling into collapsed buildings by hand. The World's Tibisay Zea meets its 80-year-old leader in La Guaira, Venezuela.