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..."

A crude stone house. A wooden bed and table with passable craftsmanship. Piles of miscellaneous items scattered about. No matter how you looked at it, these things shouldn't have been able to instantly grab Su Mo's attention and make him gasp in surprise.


"This thing looks so familiar. I've definitely seen it somewhere before!"


After glancing at the general shape of the object under the bed and trying to use the system for an appraisal—only to receive a prompt stating the item didn't belong to him—he dropped the bedsheet and sat on the edge of the bed in deep thought.


Chapter 666 - Pocket Watch Components, Possibility of Complete Restoration! Part 1