Genuinely curious

I watched a 2 hour long documentary because I was genuinely curious as to why people believe the earth is flat. It couldn't produce a single piece of evidence, in fact, the two experiments done by flat earthers actually disproved the theory. I was waiting for some evidence to come up in the documentary that made me think "hmm" but there wasn't a single thing. Can anyone provide a resource to an actual legitimate scientific experiment from a legitimate source that makes the argument even somewhat compelling? Currently assuming that nothing like that exists.