My diamond mining has almost disappeared! it has left a little caving that is with fire and water. i have not experiment with the creative or with lava!

My world (houses, nether, bases) are fine!Unable to render embedded object: File (i havent lost any diamonds) not found.!
i think that my mining is so big as it was when i downloaded the snapshots one month before!!! But i hadnt put lava!
Sorry for my english!