Catty Catty Catty

As disaster was about to strike, a group of survivors transmigrated into a desolated world and were challenged to a game of survival. From terrifying acid rains, to endless natural disasters, the heavens burn while the earth scorches, radiation is rampant, and nobody is spared from the dangers of this hellscape. The only way one survives is by building a shelter and slowly upgrading it in hopes of surviving another day. 
Luckily, Su Mo awoke a Doomsday Survival System that allowed him to infinitely level up and upgrade his shelter! The main shelter wooden door can be upgraded into a metal door, which in turn upgrades into a composite gate; the wooden spears can be upgraded into bronze spears, which eventually upgrade all the way into electromagnetic spears... While everyone struggled to survive, Su Mo was fully loaded, and well equipped to dominate the post-apocalyptic world. 
"While some of us are lighting oil lamps, he's been using refrigerators!" 
"The walls in his shelter alone are tens of meters thick, it's the safest place on this planet."
"Before I die, I wish to spend one day in his shelter..."

EndlessFantasy Translation 

My Post-Apocalyptic Shelter Levels Up Infinitely!

LambSheepMutton

The rifles carried on their backs were also adjusted to ready-to-fire mode. The four teams consisting of forty people, including the Liu brothers, began cautiously entering the cave under Su Mo's leadership.

"A battle must have broken out here, and the attackers likely have guns!"

Su Mo took four steps into the cave and observed the traces on the cave walls. He took a step forward, removed his gloves, and gently rubbed the traces with his hands.

The traces left on the wall would be familiar to anyone who had used a gun. It was the burn mark left by bullets rubbing against the wall.

Su Mo leaned closer to smell it, and the slightly irritating smell matched up with his prediction.

"This group of people had constantly been robbing people that passed by every day! I knew sooner or later karma would get back to them!"

The Clues, the Timeline Does Not Match Up! Part 2