Matt Carricker (of Demolition Ranch fame) has a second YouTube channel (Off the Ranch) where he does non-gun stuff (so he doesn't have to worry as much about getting randomly demonetized). Earlier this year, he bought an abandoned resort that he's working on bringing back into operation, and it has some caves that he has been exploring.
I'm not exactly claustrophobic, but I'm not overly fond of tight spaces either. This video of them exploring a water-filled cave was making me feel just a wee bit claustrophobic, though...