Uber employee "Lucas" opened the "Slack" application, which the company's employees use to communicate among themselves. He found a message from an unknown person stating: "I declare that I am a hacker, and that Uber is suffering from a data breach."" There was no evidence that the hack involved access to sensitive user data such as their trip histories " but the problem quickly turned out to be more complex than Uber claimed.The idea is that this hacker confirmed that he was working alone and that he was only 18 years old, and bragged about explaining how he carried out the hack, while he was not afraid of the authorities because he lived outside the United States.