CAPE CANAVERAL (AP):  SpaceX chalked up another failed landing Tuesday for its futuristic, bullet-shaped Starship, as the prototype Mars rocket broke apart right before touchdown.

A camera on the rocket froze not quite six minutes into the test flight, and dense fog in South Texas obscured views of the ruptured rocket.

Other video showed debris raining down and explosions could be heard.

SpaceX chief executive Elon Musk tweeted that at least the crater is in the right place! He's named the launch and landing area at the southeastern tip of Texas, near the Mexico border, Starbase.

This was the fourth full-scale stainless steel model to launch since December to an altitude of more than 6 miles (10 kilometers). The previous three exploded at touchdown or shortly afterward.

Another exciting test, as we say, SpaceX launch commentator John Insprucker said as he concluded the webcast.

SpaceX plans to use Starship to send astronauts and cargo to the moon and, ultimately, Mars. Musk said earlier this month that SpaceX will be landing Starships on Mars well before 2030.

But he noted that the really hard threshold is making Mars Base Alpha self-sustaining.