Kennedy, Rambam and Williams investigate Nazi vestiges in Charata, Argentina. They visit an old school and an isolated farm. Searching for an underground bunker, they use Ground Penetrating Radar at property formerly owned by Carlos Buck.

Kennedy investigates Nazi artifacts at a dig of three buildings located in the jungle of the Misiones province of Argentina. DePaul considers the remains of the Fuhrer bunker and exit tunnels in Berlin, Germany.

DePaul searches for a tunnel escape route between the Fuhrer bunker and the Tempelhof airport. Meanwhile in Argentina, Rambam, Kennedy and Williams visit San Antonio Oeste to learn about the Lahusen Wool Co. and U-boat activity in 1945.

With GPR DePaul looks for a connecting tunnel in Berlin. Kennedy does a grid search for a scuttled U-boat off of Argentina. DePaul and Williams visit the Galicia region for clues in Franco's Spain and see the port city of Vigo.

Kennedy dives to the sonar hit in Argentina. Using Skype, Baer and Cencich conduct an interview. DePaul and Williams view the Samos monastery and Nazi RDF equipment in Spain. They proceed to investigate U-boat use of the Canary Islands.

DePaul and Williams view tunnels and visit Villa Winter in the Canary Islands. After being directed to Bariloche, Argentina, Kennedy and Cervantes reconnoiter the secluded Inalco House on Lake Nahuel Huapi.

The team goes to La Falda, Argentina. Kennedy uses GPR to search for a tunnel from the Hotel Eden. Williams interviews an eyewitness. Another FBI report leads Kennedy and Williams to investigate a 1947 ballet at the Cassino Hotel in Brazil.

After an inquiry for a communications tower in Cassino, Baer now eyes Bogota, Colombia. To substantiate a 1948 report that Hitler flew there to develop V-3 capability, Kennedy searches for the burned remains of a plane buried in a marsh.