In 1971 Descended the full length of the Amazon River as the Leader of a Hitotsubashi University Amazon Basin Exploration Expedition. In the next 24 years visited this region 31 times, for a cumulative total of more than 10 years, hiking extensively in the central Andes, the Amazon headwaters region, Patagonia, the Atacama Plateau, the Guiana Plateau and the Rio Orinoco region. 1975 Graduated from the (undergraduate) Law Department of Hitotsubashi University. 1982 Graduated from the school of Medicine, Yokohama City University.

After the passage of the American satellite Landsat II, with the top of Peru, the end of the year 1975, then the localization of "the pyramides", a few months later - in May 1976 -, by the Peruvian archaeologist Rodolfo Bragagnini, starting from these satellite stereotypes, the interest rebounds suddenly, at the end of the decade, to find this lost city.  

At that time, 29 years a Japanese student, Sekino Yoshiharu, claimed to have penetrated, only, the area, by the terrestrial way, in December 1977.
He was convinced that "the pyramides" located by Landsat was only of natural origin, although it recognized that it had not remained sufficiently a long time on the site to carry out a search there deepened...

He noticed also a second bizarrery: two rectangles "mammouth" which were drawn up in a contrast marked with their natural environment.

He met, at the time of his tour, two Machiguengas Indians who claimed to have massacred the browser and photographer French SERGE DEBRU, in 1971, like his two fellow-members.

Several American researchers, among whom HERB SAWINSKI, former president of Strong Lauderdale Museum Of Science And Archaeology, Florida (today Graves Museum Of Archaeology and Natural History), but also archaeologist, pilot and plunger and Mr. PHILIP MILLER, also of Strong Lauderdaley flew over ' ' the pyramides' ' in small machines and photographed them to about fifty meters of altitude.

One notes on a several collapse near the node, which would tend to indicate that they were built or consolidated by the man. The difference in colouring of the vegetation proves that they are of a different material than that constituting the surrounding ground. "There is, moreover, two enormous rectangular formations, currently covered by the trees, and two other semicircular; they are not as high as the pyramids. They are located at the south, but form part of the unit. High semicircular edges are drawn up finally at each end of the complex; perhaps it acts walls".

HERB SAWINSKI noticed also other formations, forms and of size different, but always laid out in a symmetrical way, according to a plan established obviously well. However, HERB SAWINSKI points out:

"This version would not explain the other structures. I believe that the whole of this complex could be the vestiges of an old city built by some race having preceded by several thousands of years Incas. "