The team heads to Latvia to search for an abandoned German 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.
At a key trench line on the Courland Peninsula, the team stumbles on a live high-explosive shell and calls in an army bomb-disposal squad for help.