system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] How did Gimli not know of the demise of Moria? It is told that the dwarves released the balrog some 900 years before gandalf took the fellowship beneath the mountains. How did Gimli not know of the demise of Moria?
gpt
Remember when they found the tomb of Balin, son of Fundin, Lord of Moria? 

Remember Balin from *The Hobbit?*

Same guy. 

He lead an expedition from the Lonely Mountain to Moria - another fallen and abandoned home of the Longbeard clan. They had established a colony there, sending letters and even starting up mining again... but then the letters stopped. That's one of the reasons Gimli (and the other dwarves) were in Rivendell. They wanted to talk to Elrond about the situation, then see if they could reconnect with their brothers and find out why the letters stopped arriving. 

He was expecting to find his kinsmen.