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First flight of Starship to use the hot staging. The hot staging manoeuvre was successful however B9 exploded shortly after the beginning of its boostback due to an energetic engine failure. S25 continued until ~T+08:00 when a planned liquid oxygen venting resulted in a fuel leak in the ship's aft end leading to a fire in the flight computer, a loss of communications, a full engine shutdown, and ultimately, the activation of the Flight Termination System causing S25 to explode thus ending the flight