Journey to the Forgotten Cave

The year is 4096, humans have travelled throughout the galaxy and have yet to encounter another life form but they feel it is very imminent. Similar to what they did when sending the Voyager Spacecraft as a reconnaissance beacon, they have decided to scatter historical relics throughout the cosmos as a way to create potential first contact with other life forms. However, some of them have been forgotten for more than a millennium and are being rediscovered by the new generation of travelers. The main access to the cave is through a concrete field that shatters as a way to get inside. From there, one would have to take one of the 6 Portals (named after historical space probes) and climb through to get to the cave where they can rest and discover historical objects and music that have been left there with time