NYU graduate student Dejian Zeng pulled back the curtain on Apple’s factories in a tell-all that details his six-week stint working on an iPhone assembly line in China.

Zeng’s lengthy interview reveals details on everything from conditions inside a Pegatron dormitory to how Apple slowly shifts production for new iPhone models. Some of the most interesting bits, though, are the tiny details that show how working in an Apple factory could drive you crazy.

Here are the wildest details Zeng revealed.

Horrible sleeping conditions. Bad food. And boring tasks.

That’s what you can expect if you ever land at job at an iPhone factory, according to an ex-Pegatron employee and NYU grad student who went undercover at one of Apple’s factories in China.

President Donald Trump has called on Apple to bring iPhone manufacturing jobs to the U.S., but if Americans learn what it’s really like inside an iPhone factory, filling those jobs might be impossible.