Deep Space War: Planetary Humans

The extraterrestrial civilization Klan invades the solar system. The Klans do not have a powerful physical body, but they control the top mechanical civilization and mass-produce countless octopus-shaped killing mechanical bodies. This type of robot has ultra-high speed, full coverage detection, and devastating melee attack power, making conventional human thermal weapons completely ineffective. In just half a year, the entire surface of the earth fell. The human governments merged into the United Earth Alliance, and the remaining humans were forced to move into deep shelters thousands of meters underground to survive. The surface of the earth has been reduced to dead ruins and alien hunting grounds.