Talk:Let's Play Minecraft/@comment-156.26.170.128-20140315195414/@comment-1293965-20140316191124

Yes there is. They referred to it as a vault and inside it contains numerous chests with various materials that could come in handy while they're not in creative mode. It appeared in Let's Play Minecraft Episode 62 - Creeper Census. I'm not sure if it was shown before that.