Okay! Our answers were organic-related because that's what we thought you were asking. Hopefully this helps:
The Labyrinth beneath the city is, indeed, sprawling, but seems to mirror the city above in streetways. Most of the construction taking place in Struxta is (1) not massively prevalent and (2) seems to be building upward, rather than digging downward. There's not much need for the androids to be underground, so they don't seem to do a lot of digging as a result. Struxta is not a NYC or Boston or Los Angeles type of vibe -- any "new" constructs seem to be only built with purpose. They need more storage space, they create a new warehouse on a spare bit of space -- but most of the city seems to be claimed for, with few "digging" projects going on. There's not really a lot of spontaneous building going on, especially since there's not really a need for additional housing or the like, given androids don't reproduce.
Additionally, as Akira discovered, the tunnels themselves seem to be abandoned and not well-lit -- no one has constructed new pathways underground in quite some time. The androids also have no need to explore underground, so they don't do so. After a lengthy exploration of the city, looking specifically for entranceways into the underground tunnels, there truly only seems to be that one specific entrance. Anything entrance underground, it seems, is human-sized. There does not seem to have been a need for larger androids underneath the surface. If you ask the androids about any entrance underground, they will respond that they do not need to go underground unless they need to explain a power line, which are buried relatively shallowly in the "surface" -- about two feet, whereas the tunnels are much deeper than that.
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The Labyrinth beneath the city is, indeed, sprawling, but seems to mirror the city above in streetways. Most of the construction taking place in Struxta is (1) not massively prevalent and (2) seems to be building upward, rather than digging downward. There's not much need for the androids to be underground, so they don't seem to do a lot of digging as a result. Struxta is not a NYC or Boston or Los Angeles type of vibe -- any "new" constructs seem to be only built with purpose. They need more storage space, they create a new warehouse on a spare bit of space -- but most of the city seems to be claimed for, with few "digging" projects going on. There's not really a lot of spontaneous building going on, especially since there's not really a need for additional housing or the like, given androids don't reproduce.
Additionally, as Akira discovered, the tunnels themselves seem to be abandoned and not well-lit -- no one has constructed new pathways underground in quite some time. The androids also have no need to explore underground, so they don't do so. After a lengthy exploration of the city, looking specifically for entranceways into the underground tunnels, there truly only seems to be that one specific entrance. Anything entrance underground, it seems, is human-sized. There does not seem to have been a need for larger androids underneath the surface. If you ask the androids about any entrance underground, they will respond that they do not need to go underground unless they need to explain a power line, which are buried relatively shallowly in the "surface" -- about two feet, whereas the tunnels are much deeper than that.