We know how it ended, but this is how the flight test began.
Subsequent tweets from SpaceX said, “As if the flight test was not exciting enough, Starship experienced a rapid unscheduled disassembly before stage separation. Teams will continue to review data and work toward our next flight test. With a test like this, success comes from what we learn, and today’s test will help us improve Starship’s reliability as SpaceX seeks to make life multi-planetary. Congratulations to the entire SpaceX team on an exciting first integrated flight test of Starship!