The secret of the top secret event that tens of thousands of people disappeared without a trace overnight was that the Soviet Union secretly shot and killed these tens of thousands of people, and later, in order to cover this up, the pot was poured on Germany's head, but Germany was not a fool. Domestic experts came to the Kayan forest where these Polish officers were shot. After a series of investigations and evidence collection, they finally pointed their finger at the Soviet Union.

The most obvious evidence is that these officers were shot in the back of the head, and at that time, it was well known that only the Soviet Union would use this method of killing when executing prisoners. However, the Soviet Union refused to admit this accusation, lied to Poland that it didn't even believe, so as to clear its guilt, and even signed an alliance treaty with Poland later. From this we can see how immoral the Soviet Union was at that time.

Faced with the attitude of the Soviet Union, the weak Poland had no choice but to bite its teeth and swallow it. Although the situation was not very good, Poland still did not give up pleading for these dead officers, so Poland found the United States and Britain and wanted them to come forward and force the Soviet Union to admit it. But in the end, the Soviet Union simply ignored Britain and the United States, tore up the previous alliance treaty and unilaterally announced the breaking of diplomatic relations with Poland.

It can also be seen how real it is that weak countries have no diplomacy. Imagine, if the waves were very strong, I think the Soviet Union would definitely not dare to do so, and then this matter was dragged on until Russia admitted that the Katyn tragedy was done by the Soviet Union, and the secret surfaced.