Geek Trivia: The Largest Man-Made Explosion, Prior To The Invention Of The Atomic Bomb, Was A Result Of A?

The Largest Man-Made Explosion, Prior To The Invention Of The Atomic Bomb, Was A Result Of A?

  1. Ammunition Factory Fire
  2. Civil War Sabotage Attempt
  3. Maritime Accident
  4. Gas Pipeline Leak

Think you know the answer?