Making cell phones takes a lot of materials and tools. Senku begins by upgrading their equipment using the waterwheel Chrome and Kaseki invented and built together.
With gears and a waterwheel, 
the age of human power is over.
.بالمسننات والناعورة ينتهي عصر القوة البشرية
Mit Rädern und Wasserrädern
Avec des engrenages
et une roue à aubes,
Con ingranaggi e ruote idrauliche...
Com engrenagens e um moinho de vento 
a era da potência humana acabou.