MTL - Billion Technology Crystal System - Chapter 751 : Who dares to bother? Be sure!

... n and build a city capable of accommodating millions of people around 1,500 meters.

The underground city is built, and the air filter, water source, food, etc. must have a fairly complete equipment.

if not.

No fresh air, no water, no food, what should I do?

Starvation, thirst, suffocation and death.

This is not what Ye Fan wants to see.

Just like the diamond bit of an octopus, it is digging wildly. A lot of mud and gravel are excavated, and the gravel an ...