That black thing is a miniship. It's the same as you can find minibrots about everywhere in the mandelbrot set. But the miniships often get pretty distorted, while the minibrots in the mandelbrot set keep almost the same shape.
You can use Kalles Fraktaler from www.chillheimer.de/kallesfrakt… to explore both the Mandelbrot set and the Burning Ship Fractal. To switch to the Burning Ship, go to menu > Actions > Iterations > Fractal Type > Burning Ship.