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　　Nazi diehard and fanatics fight to the last man to stop Allied forces from freeing Europe, keeping an unrelenting grip on the naval bases, citadels and fortresses of occupied Europe.　　S4 E1. Killer Causeway　　After the landing on Normandy Beach, the Battle of Carentan breaks out and an American unit launches a desperate bayonet charge.　　S4 E2. Bunker Blitz　　Nazi diehard and fanatics fight to the last man to stop Allied forces from freeing Europe, keeping an unrelenting grip on the naval bases, citadels and fortresses of occupied Europe.　　S4 E3. Suicide Hill　　A Japanese American regiment fights through darkened forests, heavy rains and entrenched Nazis to reach a lost U.S. battalion in the Vosges Mountains.　　S4 E4. Panzer Rush　　During the Battle of the Bulge, a young U.S. scout gets trapped behind enemy lines.　　S4 E5. Himmler's Folly　　A United States army cook manages to stall Himmler's attempt to recapture Strasbourg.　　S4 E6. Nazi Tank Hunters　　A platoon of Canadian tank hunters engages a column of Nazi Panther tanks at nighttime.

　　原本平静的生活，突然被天降之灾撕碎；众人赋予期望的新机型，为何最终成为震动整个航空业的分水岭事件？一幕幕航空灾难大家依然记忆犹新，难以忘怀。空中浩劫第21季，将讲述近年曾经登上世界各地新闻头条的航空灾难事件背后的故事，揭开掩藏在最核心的真相。2021年4月下旬，空中浩劫第21季正式更新，敬请期待！