Continuing with our look back at some of our favourite episodes while we take a break between seasons,

this week we're going back to March 2019.

In 1969, National Geographic photographer Lauren McIntyre

travelled deep into the Amazon in search of the fabled Maya Runa tribe,

who was said to have no contact with the outside world.

What happened next left him wondering for the rest of his life,

whether it had truly occurred or not.

This is unexplained season 4, episode 4, all ways already.

It is 1987, a few miles from the mouth of the mighty Amazon river.

As a light mist hangs over its muddy waters, a whole King 600 passenger,

River Cruiser is making its gentle journey toward the sea.

In sconce in one of its rudimentary cabins, three men, no strangers to adventure,

environmentalist Jean-Michel Castó, writer Petru Pappescu, and photographer Lauren McIntyre,

are enjoying each other's company. Together they trade tails and make toasts to some of the early

European explorers, who travel those same waters many years before, in somewhat less comfortable conditions.

Before long, as they gaze out at the inscrutable mass of thick jungle passing by,

the men start to wonder about all the Indian tribes that still live to deep within it,

whose existence might still remain unknown to the outside world.

They begin to ruminate on how one might communicate with such a tribe,

or how any two people for that matter could successfully communicate with no apparent linguistic

frames of reference. As Pappescu and Castó debate the merits and possibilities of grunts and sign

language, they stumble ultimately at the question of just how though to convey more abstract thoughts.

...