The chap you were with really really should have known better
.. of course. I can't remember any of the details (early 70s) other than that the surgeon on the ride took some time to sort out the problems .. which were complicated by an ear blockage as well ... all seemed to resolve once we were back to SL.
I would have hoped that the average conservative diver would consider the (definitely non-zero) probability of a decompression .. and plan his ground rests appropriately .. given that one could see the cabin altitude peaking anywhere from 15,000 to 30,000-odd feet for a short while ...