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xkcd #3266: Holes
(imgs.xkcd.com)
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/
Had no idea Deepwater Horizon was so superlative deep, thought it was just another ocean oil drilling expedition