Now we are into full blown fiction, unfortunately. They even haul out Sir Robert Scott who was long dead. The story of a long lost German colony makes no sense in the time and place suggested and is merely a plot device.
Worse we are introduced to a magical tunnel system somehow located in the Amazon. Even its discovery fails to make use of a plausible Indian. Totally ignored is the need for serious lighting. Again none of this could happen but it has been a plot device of earliest fantasy fiction into the 1930's.
Besides lighting, it is physically impossible to penetrate tunnels much below a mere 10,000 feet. That is about two miles. At that point, rock temperature is way too high. Elementary physics and geology eliminates what is an old and attractive idea. In short a barely plausible historical fantasy runs smack into scientific reality.
The rest can be written of as pure fantasy because nothing is plausibly glossed even. We do know that habitats can be readily build down to ten thousand feet which is actually good enough for human habitats. We also know about claims regarding reptilian populations doing just that which we have as yet been unable to show as fiction. In short it is possible to provide a real gloss to this narrative to get them underground and keep them there and have it supported by other reports. Yet it is assumed that all this is even possible when it is not and if written in the past fifty years ignores those exact questions.
Vanishing Germans Discover the Mystery of the Ages
By territorial aggrandizement, Pope Pius V had issued a Papal Bull dividing the interior of South America, between the Spanish on the west bank of the Amazon and the Portugese on the east bank.
The inner-race dwellers strongly resented the newcomers and agreed to guide them back to the surface if they would vacate and leave. Germans who still dwell in these original interior cities say the interior of the earth's mantle is filled with many cities inhabited by the "evil ones." These Germans who have now lived in the tunnel cities below South America for over 400 years, contend that the entire mantle of the earth is filled with different races of rock dwellers who went underground for survival after different surface upheavals or floods which occurred during the former pre-adamite and postadamite civilizations. They contend there are literally hundreds of huge cities located in pockets around the globe and under the seas, from 350 feet below the outer surface to many miles in depth. The German colonists of 1572 may have been the latest arrivals to wander into the earth's mantle - like it - and remain.
mannerisms. What was missing was the presence of old people, the Germans quickly noted.
In late 1944 and early 1945, the Germans also shipped many trainloads of supplies to Spain to be lifted by the round wing planes or loaded on new super subs and older-class subs nicknamed "sea cows" for eventual delivery up the Amazon to interior ports. These subs were eventually scuttled at the war's end.