こちらのDVDは輸入盤DVDですがリージョン＝ALLですので国内製DVDプレイヤーでも視聴可能です。種別：DIGITAL VIDEO DISCジャンル：Special Interest-Documentary発売日：2021/7/16公開年：2018ディスク枚数：2コメント：They were stunning tragedies that would shake a nation to it's core, and ultimately would leave it less complacent about it's institutions, suppositions, and priorities. Four unforgetevents in United States history-the January 1986 explosion of the Space Shuttle Challenger, the April 1993 burning of the Branch Davidian compound at Waco, the April 2013 terrorist bombings at the Boston Marathon, and the attacks of 9/11-receive compelling coverage in this History Channel series. 3 1/3 hrs. On 2 discs. Widescreen; Soundtrack: English. Region Free