The Protective Dome is a bunker designed to withstand Cell's rampage. It was built by the wealthy businessman Mr. Borbonne near Chazke Village to make money from people who will pay to get inside to avoid death from Cell. In reality, the dome is nothing against Cell's strength, as Gohan demonstrates by destroying it with an energy wave.
Inside the dome, there is an office for Mr. Borbonne where he keeps a safe containing his money. On one of the walls of Mr. Borbonne's office, there is a valuable cubism painting.
At the shelter's unveiling, Lime plays a trick by claiming that Cell is coming. Mr. Borbonne runs into the shelter and locks himself in, leaving the villagers outside. After Mercenary Tao, who was hired by Mr. Borbonne, realizes that Gohan is Goku's son, he gives up without a fight and flies away. Gohan then easily destroys the shelter with an energy wave and tells the villagers that Cell is stronger and would have done much worse. Mr. Borbonne confesses and repeals his act to build a bunker, otherwise representing that there is a hope of defeating Cell.