Blaze (Freeview) Friday

How extraordinary curiosities - once concealed within the planet's desert sands - are being finally brought to light by the elements themselves

The team uses high-tech sidescan sonar and deep sea magnetometers to search for evidence after learning of an encounter with an underwater phenomenon

Giorgio Tsoukalos takes a look back at the most compelling investigations of all, and events that he believes represent real encounters with extraterrestrial visitors