Compared to the sky blue of the Deep-sea Shelter, the faint green of the main shelter's interface was always so gratifying. Moreover, it symbolized nature, life, and hope as well.
Seeing the new features expanded after the shelter level was upgraded to lv2, Su Mo nodded in satisfaction. At the same time, he tapped on the small question mark that appeared behind the level banner, selecting it in his mind.
This question mark did not appear during the last upgrade, but only did during this upgrade.
[Underground Refuge Lv3 Upgrade Preview]
[Condition 1: The main shelter should have already survived at least three disasters and, when the disaster ends, the durability of the shelter cannot be less than 50%. (Automatically entering the position of top ten in the world +1)]
[Condition 2: The overall area of the main shelter should be more than 200 square meters, and should have a complete living support system (bedroom, kitchen, bathroom...)]
