I've seen people seeking similar help on this forum before so I figured I'd give it a try. This is something from the 50's or 60's I think that I saw on TV in the late 70's most likely. I'm not sure if it was a film or even something episodic like Outer Limits. There’s some kind of shaft/pit going down into the earth that a father and son come upon. The father get winched down into the pit in a basket. Apparently he encounters some kind of horrible creature in the pit because when the son hoists him back up he’s gone completely insane and runs off. The scene always stuck in my mind- I remember I found the son witnessing his father going insane very disturbing at the time. Probably because I was of a similar age. Also, the fact that I don't think you got to see what the father saw seemed pretty creepy. Anyways, those are all the vague details I have. Thanks in advance- any help is appreciated.