Super Heavy booster that was used for the second Starship integrated flight test and lost after separation.
Second test flight of the two-stage Starship launch vehicle. The booster is expected to separate 170 seconds into flight and return to land approximately 32 km off the shore in the Gulf of Mexico. The second stage will follow a suborbital trajectory and perform an unpowered splashdown approximately 100 km off the northwest coast of Kauai (Hawaii).
Suborbital Booster 9 - Maiden Flight Gulf of Mexico