Hollow Rock Research Site
From Official Sixty Four Wiki
Hollow Rock Research Site is one of the Machines in Sixty Four.
Hollow Rock Research Site is a machine that increases the amount of 
Hell Gem destroyed when they're annihilated by 
Celestial Foam and spawns 
Hollow Stone.
Hollow Rock Research Site is unlocked when ?
Hollow Rock Research Site Function[edit | edit source]
Hollow Rock Research Site's main function is to unlock Hollow Stone.
Hollow Rock Research Site Construction Costs[edit | edit source]
Hollow Rock Research Site can only be built once.
Hollow Rock Research Site is an upgrade of 
Hollow Rock so it must be built on top of it.
| Stones | Costs |
|---|---|
 Charonite |
16,384 |
 Elmerine |
16,384 |
 Qanetite |
16,384 |
 Beta-Pylene |
16,384 |
| Celestial Foam |
16,384 |