285' surface supplied in a wetpot chamber, like thousands of other US Navy First Class divers of the era... and no, I never even heard of anyone getting oxygen toxicity symptoms on these qualification dives.
Maybe 25 dry chamber dives to 250', mostly testing equipment.
At least 50 surface supplied dives to 240' commercially -- before it was as regulated as today.
More than 75 short duration (< 20 minutes) on Scuba to 230'. Three to 260'. I can't say these were true commercial dives, more like treasure hunts/salvage that didn't pay off. A lot more to 220' I would classify as recreational, mostly for a brass fever fix.
Recommended without a lot of training, support, and preparation; definitely no. Certain death from Oxygen toxicity, Nitrogen Narcosis induced screw-ups, or decompression sickness... apparently not. Except for dives I class as recreational, there was always a chamber onboard. For recreational dives there was always a chamber within 10 miles and close chopper support.
Now consider tech divers. Yes they make dives like this and deeper, but on Trimix. Some even use a rebreathers for optimal O2. But the vast majority dive without a chamber on site. The difference in sensibilities is interesting.