The Steel Castle Under the Apocalypse

In the sudden apocalypse, the world changes drastically, humans turn into zombies, and alien creatures invade the earth. Traveling to this parallel world, Su Yang unlocked the black technology system, guns, cannons? These are just the most basic. In addition to these, Armor, mechas, spaceships and battleships can all be manufactured. There is nothing impossible, only unimaginable. Look at how Su Yang can pull together an invincible team and build an unbreakable fortress in this apocalyptic world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.