7月19日，回到西安的母亲告诉龙先生，因为手机设置的拦截电话，让她没办法出租房子，让儿子替她解除掉。龙先生坚持让母亲通过微信的方式联系租客，并提醒她已被诈骗集团盯上了，千万要小心。没想到，龙妈妈随后就去了一家手机店，让店里的销售员给解开了禁止接收陌生来电的功能。第一道防线就这样破了。
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But what if it’s not fine? Even back in 1996, before a single component of the ISS was launched into orbit, NASA foresaw the possibility of an even worse worst-case scenario: an uncontrolled reentry. The crux of this scenario involves multiple systems failing in an improbable but not completely impossible cascade. Cabin depressurization could damage the avionics. The electrical power system could go offline, along with thermal control and data handling. Without these, systems controlling coolant and even propellant could break down. Unmoored, the ISS would edge slowly toward Earth, maybe over a year or two, with no way to control where it is headed or where its debris might land. And no, we could not save ourselves by blowing the station up. This would be extremely dangerous and almost certainly create an enormous amount of space trash—which is how we got into this hypothetical mess in the first place.