Season 1 National Geographic , 2007 - 2008 Watch now Season 2 National Geographic , 2008 Season 3 National Geographic , 2008 - 2009 Watch now Season 4 National Geographic , 2009 Watch now Season 5 National Geographic , 2010 Watch now Season 6 National Geographic , 2011 Watch now Season 7 National Geographic , 2012 Watch now Season 8 National Geographic , 2012 Watch now Season 9 National Geographic , 2013 Watch now Season 10 5 , 2016 Watch now Season 11 National Geographic , 2018 Watch now Season 12 National Geographic , 2019 Watch now Season 13 National Geographic , 2020 Watch now Season 14 National Geographic , 2021
, 2016
, 2007 - 2008
