with SWB being ever present or possible I can't believe anybody would be stupid enough to solo freedive, think of all of the things that could go wrong, especially on a deeper dive. If you want to practice your breathhold skills, do so laying on your couch, or walk around if you want to exert yourself, a lot less likely to drown if you pass out in your living room than at the bottom of the ocean. Where I freedive we have kelp, and more than once I have gotten stuck in it, once only 6 feet from the surface. Luckily I got out and had a buddy, but without a buddy, it could have been days before they found my body, if ever