After getting more established with my little farm and completely securing my food needs, I began to explore a cave system.    It’s easily the most mammoth one I’ve ever seen.

Lapis and Redstone down here

Next step was to dig my way through to the top of the earth and create a more direct route into this underground chasm.    If I want, I can start strip mining from here.

Christened “Cave of Wonders”

When I started exploring, this was the first cave that had a little “Central hub” from which many other tunnels seemed to branch off.   I closed off a few and the rest got labeled.

Lots of spur tunnels from here

The plan is to dig deeper from this point, since I understand that you get better items (like, diamonds) the deeper you go without hitting bedrock.