Reliken [The Relic]

The legend goes: Cthulhu attacked the Elders of Earth. The servants of the Elders uttered a curse that forbade the Great Elders from dwelling beneath the stars. Cthulhu lay dormant in R'lyeh to await the time when his servants would awaken him. R'lyeh sank to the bottom of the sea and his mental powers lost their grip on humanity. Sometimes he tries to call people to him and wake him up. But in vain because no one knows where R'lyeh is. Your old history professor has contacted you to ask for help. On his latest journey, he has found a mythical statue that is said to possess infinite knowledge. After his return, he has seen evil cultists following him and has therefore chosen to go underground. Can you figure out where the professor hid the statue?