So, anyways. i was playing on my single player world, and i'm just digging in the side of a mountain, when i run into a cave. i explore, when i find lava, and diamonds. just an average day, when i find more diamonds. i then explore some more. for an hour and a half, to be exact, and return to the surface with 6 diamonds, 30 iron, 72 redstone, 12 gold, and a lot of coal. this is big 'cuz it was my first ever diamond. so, yeah. It is A huge cave system along with another cave system around where i built my house. I built it in the snow biome near the jungle spawn. seed will eventually be posted.