1000 meters underground.
The vertical tunnel down was replaced by a new elevator supported by a durable graphene beam heading directly into the deep underground.
Jiang Chen, in T-3 power armor, was now on the elevator with his eyes focused on the hologram instructions in the helmet. The decreasing oxygen concentration made Jiang Chen especially wary.
Just like he expected, the fallout shelter underground wasn't designed for humans.
Lin Lin was standing beside him and she was completely covered by an orange protective suit with a large oxygen tank strapped behind her. Although she was a digitalized human, her brain, and vital organs were still made out of organic matter. Even if a lot of organic parts were replaced by mechanical parts, she was still a human.
"Open the oxygen supply device." When the oxygen concentration dropped below the threshold, Jiang Chen said calmly.