Life started to become boring and dull.
The boredom stemmed from the certainty that life in the shelter would be dull—limited space and limited activities, and most importantly, Gao Yuan had no skills that could be useful in this base hidden deep under the mountain.
The entire Supreme Command was a large base, but not a shelter. Do you know the difference?
That is, although the Supreme Command had thirteen sub-bases, the purpose of all these bases was not simply to provide survivors with a haven.
These thirteen bases took on roles in scientific research, production, and command, and of course, they had a military function as well. In other words, essentially all of Shenzhou's elite were within this mountainous base.