SpaceX, the private space technology company owned by Elon Musk, is asking federal authorities to approve a new round of tests for a prototype reusable rocket, but some of them may never make it back to the surface intact and will crash in the ocean.

SpaceX launched Starship on Thursday for a seventh test flight, after weather concerns pushed back an experiment that will feature the spacecraft’s first payload deployment test, and while it successfully caught the Super Heavy Booster, Starship lost connection and “experienced a rapid unscheduled disassembly.”

SpaceX confirmed the upper stage had undergone "rapid unscheduled disassembly," the company's euphemism for an explosion.