The underground works off of the normal wireless connection. the only time other people will be in the underground with you is if there are other people playing in the underground near you.
No, only if both sets are empty. The intersection of disjoint sets is always empty.
zone of saturation
There are always underground radio stations.
Impermeable Rock
The layer underground where there are no empty spaces for water or air is known as the impermeable layer. This layer prevents the movement of fluids such as water or air because it is tightly compacted and does not allow permeation.
after a while it is buried underground like deserts and empty fields
Zone of aeration
No. An underground pool needs strong walls to hold the soil out (when it's empty) and the water in. Usually they are cast concrete.
No, they do not.
The layer underground with no empty spaces for water or air is called the impermeable layer. It acts as a barrier preventing the movement of fluids or gases through it. This layer can consist of materials such as clay, shale, or compacted rock.
Because there's never any change in it.
Impermeable Rock