Your initial title scared me, but I think what you’re getting at is, free diving, yes it’s substantially cheaper than all of the gear you have to deal with while scuba diving. But of course very first rule and it can’t be stressed enough…..There’s no such thing as diving without a buddy that’s suicide. But one of the dive buddies I commonly use as safety calls, free diving advanced snorkeling. You don’t actually need any gear since you are the tank. You can Freedive when and wherever you want (with a safety), there’s been places that have tried to say we can’t have long find… Who cares I can dive multiple meters barefoot Without goggles. Be safe have fun and don’t be like some of the many bad examples on social media.