1 It could be that there is a blockage in the Eustachian tube, that is the part past your eardrum. This can be caused by a swelling or mucus. this causes the pressure on the eardrum not to be balanced so stretching the eardrum and therefore pain in the ear.
As Illustrious states you can 'clear' your ears by holding your nose, keeping your mouth closed and 'blowing'. Swallowing or yawning are just as good
Having a cold or catarrh can also affect your Eustachian tubes so never dive in that condition.
2 Your Eustachian tube could be clear but you could have a blockage of the outer ear due to a build=up of wax.
You can get treatment from a chemist to deal with this. Otherwise see your doctor.
Never dive with earplugs.
Take it slowly let your ears ajust to the pressure change.
Regarding B. Hur, Chariots have been 'driven' underwater.
Rover

