I call secret caves caverns for those who don't know. I don't know if that's what they're really called but I'm going to call them that.
Minecraft: Feed the Beast Modpack Review
MINECRAFT: Jurassic Park =]
Feed The Beast - CoOp with Friends - Episode 2
Technic with Sips - Part 3 - Pumping for Mulch
Hardcore Minecraft: Episode 2 - AFK Ownage!
MoreCreeps and Weirdos - Mod Spotlight
Tekkit with Duncan - Part 11 - Black Gold!