Polish archaeologists excavated a Nazi time capsule from 1934 containing World War II newspapers, photographs, and other artifacts, according to The Independent.

The capsule was apparently buried over 80 years ago during the construction of Ordensburg Krossinsee, a school used to train Nazi leaders in Zlocieniec, Poland. Today the school is reportedly being used by the Polish Army..

According to reports in British media, Archeologists knew about the existence of the copper capsule for a number of years but hadn’t been able to extract it until now due to the surrounding concrete, water mines, and groundwater.

Inside the well-preserved capsule researchers discovered two copies of Mein Kampf, Hitler’s manifesto, photographs of the dictator, a Nazi badge, and envelopes filled with coins and letters.

The items are currently at the National Museum in Szczecin, awaiting preservation before being publicly displayed.