Grand Canyon of the United States.

A mysterious Grand Canyon that is thousands of meters deep builds an extremely huge underground world!

Various cutting-edge technologies have hollowed out a mountain range!

It is like a huge base for science fiction films, with all kinds of busy staff everywhere.

Here we gather the world's top scientists.

They not only manufactured various new combat weapons, but also cultivated a tube of green biological reagents.

This is the super warrior serum that is advertised in the newspaper.

They have started mass production!

And many soldiers were sent to this base.

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Chapter completed!