The team heads to Latvia to search for an abandoned German artillery bunker that may contain a trove of historic items.

In western Latvia, the team sets out to uncover new clues to the 1944 showdown between Hitler's SS Nordland division and Stalin's Red Army.

A search for a mass grave in western Poland yields an unexpected discovery that raises questions about a turning point in the war.

Using Soviet military reports to locate the front-line trenches on the Courland Peninsula, the team stumbles upon a live high-explosive shell and calls in an Army bomb disposal squad for help.