I've recently been binge watching Midwest Safety videos. It's like World's wildest police chases but way better, and with bodycams.
They don't publish much but USCSB videos are fascinating.
Food Wishes is a very old but consistently high quality, low chaff cooking channel.
Cave diver death stories are another favourite niche topic of mine.
Steve Mould, Stuff Made Here, Hyperspace Pirate and DIY Perks are quality science and tech video channels. I don't know why I like watching videos of a fella making cryogenic coolers and liquid CO2 in his basement, but I do.