This type of a huge torus-shaped vessel contains a complete biosphere.
We can see two of these ships explode in the flashback of the Burn in DIS: "People of Earth".
One remaining vessel (the "flying rainforest" according to Tilly) appears prominently at the Federation Headquarters since DIS: "Die Trying" and is initially so dominant that we might think it *is* the Headquarters.
The surviving ship is purportedly the USS Maathai NCC-325023 (named for Kenyan activist Wangari Maathai) according to officially released production artwork from CBS, although it has not been identified on screen. The class is presumably named for poet Maya Angelou (1928-2014).
We can see two of these ships explode in the flashback of the Burn in DIS: "People of Earth".
One remaining vessel (the "flying rainforest" according to Tilly) appears prominently at the Federation Headquarters since DIS: "Die Trying" and is initially so dominant that we might think it *is* the Headquarters.
The surviving ship is purportedly the USS Maathai NCC-325023 (named for Kenyan activist Wangari Maathai) according to officially released production artwork from CBS, although it has not been identified on screen. The class is presumably named for poet Maya Angelou (1928-2014).