Giant Spaceship

The giant spaceship was the headquarters and mode of transportation of the Dark Matter Thieves. It was said to be an impregnable mobile fortress that utilized advanced technology. It was made of an unknown metal not found on Earth and far stronger than steel. The ship also possessed incredible firepower, capable of destroying the majority of A-City in an instant. It crashed after Saitama shattered its power source. The ship was later salvaged by Bofoi, who uses it to develop new technology.

Appearance
In the manga and anime, the ship is shaped like a tooth. In the manga, the ship is colored Steel Black, in the anime it is Purple. The ship was massive in size; it was large enough to cast a shadow over the majority of A-City and was able to destroy 99.8% of the city with a single shell bombardment directed downward.

The interior was equipped with numerous surveillance cameras, and each area was sealed with strong doors, which have repelled many intruders.

Trivia

 * In chapter 33 of the manga, Saitama is seen walking through a maze-like section of the spaceship. The drawing used as the map here is called "Papa's Maze," an incredibly detailed maze created by Kazuo Nomura.
 * According to Genos' notes, the size of the ship is 9,230 m x 15,024 m.
 * Murata stated that it takes about 4 hours to draw one panel of the spaceship (round up to 6 hours when including the sketches) as a fun fact on his stream. He did not let his assistant handle this part and he kept redrawing.
 * The ship is so resistant that it didn't fall even after a series of Saitama's "normal punches."