Title text:
If you're thinking 'Wait, a giant crystal cave in Mexico? What's that?' then I'm SO excited for the image search you're about to do.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3266/
The only thing I wish it included were total lengths as some sit higher and don’t go down as deep on an absolute scale, but on a relatively scale the shafts and height are longer.