The community's power system is suddenly overloaded, and all the light bulbs blow up and levitate in the air, forming a ball of light that surrounds Xiao Man. Su Wanqing realizes that when her daughter is asleep, the electronic ripples will repair broken buildings on their own. Chu Yun is burned on his right arm by the ball of light and the same ripples as Xiaoman's appear under his skin.
Dr. Shen creates a reverse jammer in his lab, but the moment it is activated it is burned by Xiaoman's ripples. The community radio automatically plays a recording of Dr. Lin: "When the vessel matures, all gifts will be withdrawn."
Tracking energy fluctuations, the team discovers tunnels leading to the bottom of the Yangtze River. Chu Yun modifies the diving capsule, the walls of the capsule are engraved with runes that inhibit the pattern. When diving a hundred meters underwater, the small full of ripples suddenly illuminated the entire bottom of the river - on the riverbed loomed the sixth energy tower pieced together from the remains of mechanical beasts.
When Su Wanqing touched the tower, the mech was forcefully adsorbed. Seven years ago, her husband's voice came from inside the tower: "You've finally come to replace me." Dr. Shen detects that the tower holds Dr. Lin's complete memory chip.
Xiao Man is forced to connect to the memory chip and witnesses how Dr. Lin transforms his daughter into a carrier. The entire community is suddenly plunged into a hallucinatory state: the 2012 nuclear explosion was never prevented, and all residents are turned into mechanical beasts. Chu Yun uses a modified sonic device to shatter the illusion, at the cost of losing his hearing.
When Su Wanqing chopped the memory chip, the energy tower at the bottom of the river released a purification beam. Xiao Man's lines turn silver-white and are able to instantly repair Chu Yun's mechanical arm. Dr. Shen discovers that the purification beam is removing the virus code left behind by Dr. Lin.
Upon returning to the surface, the community is refreshed. Electronic ripples fall off the residents and form shield generators in the plaza. Xiao Man folds the remains of the Memory Chip into a paper boat, which is caught by Lu Li's Void as he puts it into the river. The mecha is upgraded with purification cannons, and Chu Yun begins training the militia.
Late at night, Su Wanqing realizes that her daughter is sleepwalking to build the seventh energy tower - a miniature tower built with blocks is absorbing moonlight. When she touches the block tower, she feels the residual energy fluctuations of Lu Li.