Polish explorer claims he found underground structure allegedly meant as Hitler's nuke shelter

The abandoned building of a German nazi-era railway installation in Walim, near Walbrzych, in Poland, photographed on Friday, Sept. 11, 2015. An explorer says he has found massive underground World War II installations in the neighborhood that were probably intended as a anti-nuclear shelter for Hitler. (AP Photo) Poland Out (The Associated Press)

Explorer Krzysztof Szpakowski, right, with his legal advisor,attends a news conference at the provincial governor’s office in Walbrzych, Poland on Friday, Sept. 11, 2015. Szpakowski claimed Friday he has found a massive underground structure in southwestern Poland that, he says, the Nazis built to protect thousands of people. (AP Photo) Poland Out (The Associated Press)

A Polish explorer claims he has found massive underground structure in southwestern Poland that, he says, the Nazis built as a nuclear shelter for Hitler.

Krzysztof Szpakowski told a news conference Friday he has "no doubt" as to his find, which he says was based on evidence that he has gathered for decades, including witness statements, old documents and an examination of the area by ground-penetrating radar and by dowsers.

Speaking on TVN24, Szpakowski said the structure was part of a system of railway tunnels and corridors that the Nazis were building during World War II around the city of Walbrzych. His conference was hosted by Walbrzych regional authorities.

Two other men claim they have fund another tunnel at a separate location in Walbrzych that contains a Nazi train.