The Nazis have a train. They put expensive things on the train. They put on the train 300 tons of gold, jewels, and art. They drive this train into secret tunnels. The tunnels are in an area in Germany. This is in 1945. Now, this same area is in Poland.
All of this is only a story. It may be true. We do not know.
A group of people are building a replica of this train. They are Polish. They are working in an old factory. The replica is as big as a real train.
When they finish, they move the train. They put it at the end of a tunnel. This can be a tourist attraction. They hope that people like it. They hope that people will come see it.
You can watch the original video in the Level 3 section.