In 1968, an expedition was set off by National Geographic and Hovercraft from Manaus in Brazil to Port Of Spain (Trinidad). Aboard of a SR.N6 hoverwork the expedicionaries followed the Negro river upstream to where it is joined by the Casiquiare canal in the border between Colombia and Venezuela. After following the Casiquiare to the Orinoco River they hovered thru perilous Rapids of Maipures and Atures. The Orinoco was then traversed down to its mouths in the Gulf of Paria and then to Port of Spain. The primary purpose of the expedition was filming for the BBC series "The World About Us" the episode "The Last Great Journey on Earth from Amazon to Orinoco by Hovercraft", aired in 1970, and demonstrate the abilities of a hovercraft, thereby promoting sales of this British invention.