Alien: Earth - Crash in Prodigy city

 leading from

Alien: Earth

a) Undercity

They added an ‘undercity,’

The idea was that people lived in a ‘plus’ and ‘minus’ zone.

The ‘minus’ live under the city , whereas the ‘plus’ live above.

This was not highlighted in the show, but in wide shots of the crash, they added a ground level with buildings underneath

1. "We added an 'undercity,'" says Rothbart. "The idea was people lived in a 'plus' and 'minus' zone — the 'minus' live under the city, whereas the 'plus' live above. It's not highlighted in the show, but in wide shots of the crash, we added a ground level with buildings underneath." https://theasc.com/articles/alien-earth-vfx-cinematography

b). Prodigy towers 

For the spaceship’s importance with a brutalist high-rise structure, UPP built towers with utilitarian blocky tower level, and more refined architecture higher levels inhabited by wealthy citizens.

For wide shots of the Maginot descending, UPP generated an entirely CG city derived initially from Google Maps and Google Earth reference of Bangkok, then added futuristic towers and undercity substructures, 

Ground-level crash-site scenes were staged at Bangkok’s Neon Market, which UPP extended in mobile shots that weave through the chaos. 

1. For the spaceship's impact with a brutalist high-rise structure, UPP built towers with a utilitarian blocky lower level and more refined architectural higher levels inhabited by wealthy citizens. For wide shots of the Maginotdescending, UPP generated an entirely CG city derived initially from Google Maps and Google Earth reference of Bangkok, then added futuristic towers and undercity sub-structures. Ground-level crash-site scenes were staged at Bangkok’s Neon Market, which UPP extended in mobile shots that weave through the chaos. https://theasc.com/articles/alien-earth-vfx-cinematography

c) Crash-Site interiors

For the crash-site interiors, the production used Bangkok's long-abandoned Khao San shopping mall. 

That was an open space with ruined escalators in this abandoned mall.

Andy Nicholson built the side of the Maginot and an engine-room hallway in there, with a chasm that characters have to cross from a destroyed apartment. 

They built that as a huge, multi-level set.

Gonzales thought that it was an amazing use of space that made that sequence feel tactile."

1. For crash-site interiors, the production used Bangkok's long-abandoned Khao San shopping mall. "That was an open space with ruined escalators in this abandoned mall," says Gonzales. "Andy [Nicholson] built the side of the Maginot and an engine-room hallway in there, with a chasm that characters have to cross from a destroyed apartment. We built that as a huge, multi-level set. It was an amazing use of space that made that sequence feel tactile." https://theasc.com/articles/alien-earth-vfx-cinematography