Elon Musk told Miami’s mayor Friday that The Boring Company could dig a two-mile tunnel under the city for as little as $30 million — a fraction of the $1 billion price tag once quoted by local transit officials. Musk also told the Mayor that The Boring Company could complete the job in six months, versus the original four year estimate.

Mayor Francis Suarez shared these details about his “wonderful call” with Musk in a video posted to Twitter. “He’s focused on trying to deliver a project that will have the maximum utility for our residents for the least amount of money,” Suarez said. “The order of magnitude in terms of savings is significant.”