B22

Booster planned for Flight 15 with Ship 42. Rolled out of Mega Bay 1 on a thrust simulator on 7 September 2026, it reached Massey overnight 7–8 September and completed its cryogenic test campaign on 10 September before returning to Mega Bay 1. As of 23 October it had not yet rolled out again for its engine test.

Flight 15 (13 November 2026, with Ship 42): all 33 engines worked up to hot staging. On boostback, 32 of 33 engines relit, then the burn ended early due to low fuel mass; the GNC system triggered an automated abort and diverted the booster offshore ("booster offshore divert"). It performed a landing burn over the Gulf, then the flight termination system was triggered when the engines shut down; loss at sea off Boca Chica.

Sources: StarBase FR video of 11 September 2026 and Starship Update 219 & 222; YouTube StarBase FR — le booster explose en mer (sequence as seen from the live coverage, before the cause was detailed); NSF — Flight 15 article.