It takes a lot to actually get a brain injury and for your skull to break. Don´t make any jokes about this

, but when I was a kid, I fell from a high rock in Iceland 4-5 meters), and landed on my forehead - on another rock. My skull didn´t even break, and as far as I know, there is no brain injury

. Had to have a few stitches though.
Wonder what in fact happened to Jeremy for him to have gotten an injury serious enogh to affect him later in life - which it apparently did, taking into consideration that he couldn´t pass the requirements to become a diver.
Could it be something Jeremy made up because he didn´t pass for some other reason?