Discovery Channel HD With word of an urgent lead, Josh jets to Poland to join in the opening of a secret Nazi tunnel system dug into a dormant volcano; Josh helps a local team tear away a stone wall built by the Germans in the last days of World War II. 2026-04-01 Part 2/2. Josh Gates rafts into an abandoned tunnel system to chase art and treasure stolen by the Third Reich; the diary of a high-ranking SS officer leads to a search for tons of stolen gold; Josh searches for a buried Nazi Enigma machine. 2026-04-01 Josh tracks down the legend and treasure of an outlaw posse, who terrorized the Midwest's railroads; Josh tracks the Reno Gang's lost loot to a cave hideout that could hold millions. 2026-04-01 Josh braves the frigid, shark-infested waters off Cape Cod to dive the world's only confirmed pirate wreck; joining a high-tech recovery mission, Josh chases the multi-million-dollar treasure of Black Sam Bellamy, including coins, gold and jewels. 2026-04-01 Josh chases the fortune stolen by loyalists to Britain's crown during the American Revolution; investigations of the infamous Doan Gang; Josh helps dig up a cache of plundered coins; a cave search pinpoints the turncoats' hideout. 2026-04-01 Was the Hindenburg truly destroyed by accident or by sabotage?; could the famous Patterson-Gimlin Bigfoot footage hold clues that only modern analysis can define?; what really happened when 50,000 Persian soldiers disappeared without a trace in 524 B.C.? 2026-04-02