Here's the problem: you've done this already and have dived like this before and nothing's happened. So you start to succumb to the fallacy that "because it hasn't happened yet, it won't happen." I, too, have freedived to somewhat shallow depths alone - multiple dives to 50 ft, in fact - without ill effect, and here I am to write about it. That doesn't mean it's safe. It's possible to do the wrong thing many times without ill effect; then you start to think that you're smarter than all those who insist you "have" to do X - whether it's have a freediving partner, or wear your seatbelt in the car. The problem with freediving is that it can be hard to find partners, and especially trained partners, and even more especially trained partners who can dive when you can dive. Still, you should not freedive alone. Remember, partners are not there for when things go right; they're there for when things go wrong, and they go wrong when you don't expect it. After all, who would do that one more dive if they knew it was going to the the time when they would experience shallow water blackout? Just because you've done it before doesn't mean that you'll get away with it forever, and with freediving, mistakes are deadly.
