I was a summer intern at CERN a few years back. I had the same feeling of watching thousands of people working on projects together including tons of code, wiri

I was a summer intern at CERN a few years back. I had the same feeling of watching thousands of people working on projects together including tons of code, wiring, machinery, and complex physics to measure extremely hard things at ridiculous precision. I could never really shake the feeling that it should have been practically impossible to make such projects work. It is hard enough to not make bugs in personal projects, but when you are hundreds of people writing code and plugging in wires over time, some mistakes should appear that breaks the results.