According to Fisher Russian Fur Trade  men from Mangazeya reached the Lena by descending its tributary the Vilyuy in  three years before Pyanda allegedly reached the upper Lena via the Lower Tunguska Im very sceptical of such purported discoveries I mean  kilometers about  miles is a lot of mileage for only three and a half years I cant think of an expedition that would compare didnt Poyarkov travel a few thousand miles in about the same time period Pyanda reminds me of Juan de Fuca someone who commanded an expedition that supposedly accomplished quite a bit by a person that actually existed but was recorded years after the fact Fucas three decades to Pyandas century with little or no primary documents supporting any of the discoveries Shouldnt we be more cautious in reporting his perhaps fictional expedition