If anyone would like to get involved with cave diving, it’s somewhat accessible. For about $5k in training, $5k in equipment, and perhaps four weeks of time you can gain the experience and certification necessary to dive caves.
But it's worth it, you visit places that few people have seen with their own eye and it's safe if you follow the rules.
Obviously not everybody has that kind of extra money, but a fairly large portion of this sites user base is likely to be comprised of tech professionals with higher-than-average incomes.