Black Sunday Airship refers to the Hindenburg, a German airship that was destroyed in a catastrophic fire on May 6, 1937. The Hindenburg was a BLIMP, a type of airship filled with hydrogen gas, and it was the largest aircraft ever built at the time. The disaster occurred as the Hindenburg was attempting to dock at the Lakehurst Naval Air Station in New Jersey, and it resulted in the deaths of 36 people. The cause of the fire remains unknown, but it is believed to have been caused by a spark from the static electricity generated by the airship. The disaster was later referred to as 'Black Sunday' due to the tragic loss of life.