1. In December 2017, three men pleaded guilty to causing the largest internet outage in history - a distributed "denial of service" attack that blacked out the web across most of the US and large chunks of Northern Europe for about 12 hours. They had disabled Dyn, a company that provides Domain Name System (DNS) services — the web's directory of addresses, basically — to much of the internet.
2. And then, in April 2018, the African country of Mauritania was taken offline for two days when someone cut the single undersea cable that serves its internet.
"Someone is learning how to take down the Internet," Bruce Schneier, the CTO of IBM Resilient believes
Both attacks were conducted by relatively unsophisticated actors. The Dyn attack was done by three young men who had created some software that they merely hoped would disable a competitor's company, until it got out of control. The Mauritania attack was probably done by the government of neighbouring Sierra Leone, which was trying to manipulate local election results by crippling the media.
Apparently, it is possible to take the world offline.
It's not merely that "someone" out there is trying to figure out how to take down the internet. There are multiple someones out there who want that power. In June 2018, Atlanta's city government was hobbled by an attack that wiped out a third of its software programs. The FBI told Business Insider earlier this year that it believed terrorists would eventually attempt to take America's 911 emergency system offline.
"Someone is learning how to take down the Internet," Bruce Schneier, the CTO of IBM Resilient believes.