Piotr Koper and Andreas Richter, two treasure hunters, initiated comprehensive tests on Tuesday in order to obtain clearer visual of the rumored buried Nazi train on a Polish hillside, according to CNBC News.

The treasure hunters reopened the decades old speculation when they formally announced that they finally located the train in specific location last August.

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Koper, a native of Poland, and Richter, a German, have already generated a simple image of the buried train with the aid of ground radar.

The Nazi train was located in a place near the town of Walbryzych in Poland.

A popular folklore claims a train filled with gold, jewels and weapons was safely kept in a sealed tunnel by Nazi forces.

When the Red Soviet Army advanced into the area in 1945, the Nazis made their retreat.

The Polish military haschecked the site for potential explosives since the area was already cleared of trees and other forms of barriers. Koper and Richter are set to run three more scans to capture a clear image underneath the area.

Bad weather hindered the schedule scans and the two treasure hunters decided to begin the work on Tuesday.

Koper and Richter will use a magnetometer, a tool that will determine if the objects detected underground possess magnetic fields.

Other tools to be used include a metal detector and a radar that can detect things underground.

"We already know, namely, that under the earth there is a train. We need three good days of good weather to carry them out," said Koper, during a press conference on Monday.

Koper added that their studies will be more accurate because the area is already cleared of 'scrub'.

The digging process might have to wait until winter season in Poland ends, since spring will be more favorable, according to local officials.

The main focus at the moment is more on non-invasive tests rather than extraction, according to Arkadiusz Grudien, a local magistrate at Walbryzych.

Tagstreasure hunters, buried, nazi train, Germany, Poland, World War II