And it becomes a game of, you know, thermonuclear war.

它变成了一场热核战争的游戏。

By " the event" they mean the thermonuclear war or climate catastrophe or social unrest that ends the world as we know it, and more importantly, makes their money obsolete.

" 那件事情" 指的是热核战争、气候灾难或社会动荡毁灭了世界，更重要的是，使他们的钱过时了。