According to the latest surveys there are mole type creatures on the moon who eat the walls of the sublunar caverns your best bet is to capture one of those to facilitate travel through the caves, so befriend one if you can. You must find the keys to the cavern which contains the large monolith type object, these keys are in the form of elementary alchiems, there are 8 to get. Travelling under the moon surface will be hazardous, your suit will protect you against slight falls but be careful because if you fall too far you will surely die.
In 1985, Nodes of Yesod was launched on the ZX Spectrum. With the Spectrum Next Kickstarter, Steve Wetherill has agreed to return to the source and recreate this classic with a few special Next touches.