My OW Check-out dives were in a cavern.
My first post OW dive was Solo off the Florida coast.
I routinely dive on a 175' deep vertical wall every other weekend in the summer.
None of this really matters, but I want you to know there is a vast range of diving experience in this thread. Don't be so quick to paint all divers the same.
It's sad to see posts like this here. It sends the wrong message to folks coming in here to learn about diving.
My guess is, and correct me if I'm wrong JCAT, that your OW checkout dives were at Ginnie Springs and what you meant to say was that as a graduation dive, after being signed off on all skills and thus being certified, your OW instructor took you on a guided tour of the Ginnie Ballroom. If you actually did skills in the overhead or were taken in there prior to being certified, please PM me with your OW Instructors name.
Hundreds, if not thousands have done their check-out dives at this location and yes, it has an overhead.
I usually don't do PADI OW classes there because the area of the spring that's outside of the overhead enviornment has a max depth of 12 ft. PADI requires a dive to be at least 15 ft to count as a dive. Any dives done in Ginnie Open are NOT logable under PADI standards and so don't count towards a students certification.
Your first dive after training was a solo dive. Not a problem if you actually took the time to research how to do it safely. Did you figure out that you need a redundant gas source or did you stay within a depth that would let your do a Controlled Emergency Swimming Ascent (CESA)? Have you actually practiced CESA's from that depth?
175 feet deep. Not a problem if you're trained for it. But if you haven't done the training and haven't read up on the subject, your playing Russian Roulette. Most Nitrogen Narcosis problems don't show up until the day you have to struggle or over exert to do something, say swim against a strong current or free yourself for an entrapment. Breathing heavily greatly exacerbates the effects of Nitrogen Narcosis!
On the other hand you may just be a virtual diver, like so many on the internet -ie- all you dives done in cyberspace.
Either way, for all the folks on here looking for accurate information I would take what this diver says with a grain of salt.
Cavern Diving can be safe... Solo diving can be safe... Deep diving can be safe.
BUT NOT WITHOUT THE APPROPRIATE TRAINING!
Be safe and have fun in the water! Bruce