You take an egg and tomato own to 100feet, where the tomato looks blue as the water removes the colour red. You also do a series of maths tests to show how the nitrogen in your blood from being so deep makes you act drunk! When you crack the egg, the pressure at that depth is so great it stays whole! as it happens I ended up smashing it too hard and it dispursed underwater but the fishes were very happy with some free din dins