The Starship’s seventh test flight ended in an explosion when the vehicle’s upper stage “experienced a rapid unscheduled disassembly during its ascent burn” over the Atlantic Ocean. SpaceX chief Elon Musk posted a video of the event, with debris streaking across and lighting up the sky. During the company’s webcast, Dan Huot from SpaceX’s communications team said they “saw engines dropping out on telemetry” by the end of the ascent burn and that they ultimately lost contact with the Ship, which is what the company calls the vehicle’s upper stage. SpaceX said in a tweet that it will continue reviewing data from the test to understand the explosion’s root cause.

The Federal Aviation Administration issued an advisory for pilots after the incident, warning them about falling debris in certain areas. SpaceX said before the test that it’s meant to “launch a new generation ship with significant upgrades” and it was supposed to conduct Starship’s first payload deployment test with the help of 10 Starlink simulators.

Despite the Starship’s upper stage burning up, the test was still partially a success. The Ship’s Raptor engines fired up during the ascent burn before the ground team lost contact with it around 8 minutes into the flight. SpaceX was also able to retrieve the Super Heavy booster, catching the vehicle’s first stage with the mechanical arms on its Starbase launch tower.