A couple of people have asked me, why would you want to crack an egg under water?
And the answer is …….. To show the affects of pressure.
On an Advance Open Water course students get to go beyond the magic 18mtrs, (60ft) allowed to them as an Open Water diver, and on the course we take them to about 20-25mtrs (65-80ft) and to show the effects of pressure, we take a couple of toys.
A tennis ball, will almost flatten, at 20mtrs, an empty bottle, filled with air at the bottom and bought to the surface, with it’s top on, will burst on the way up! (This is to demonstrate why you never hold your breath!)
The egg, provided, it’s open carefully, and there’s no current, will stay egg shaped! (Until the fish realise it’s edible!)
Footnote: I don’t condone feeding fish, for this reason…. there was a family group, of Napoleon or Humphead Wrasse, a beautiful fish that grows to about 10 feet, in the Red Sea, which were fed cooked eggs by divers, it was estimated, that the family group in the diving season would get around 400 eggs A DAY!! That group ALL died!
So there you have it!
Note for Bob …I have personally cracked three or four eggs on courses, uncooked ones are not always available and the trick loses, the wow factor with a cooked one!