>>514894071
Man made sealed environments literally exist in Antarctica at this very moment so I don't know what the fuck you are even implying.
>>514893942
>how are you going to build them without resources?
The resources are already naturally present on Mars. It needs machinery, not resources.
>how are they going to ship enough machines without resources?
The resources needed to ship the machines are on Earth. The machines are being built on Earth. Look into the amount of payload v3 and v4 starship are estimated to be able to ship to Mars. You sound like an actual fucking retard.