Ya know I just realized something, the deeper you go the more buoyant the boat will become,
Take this example, put air in a balloon and hold it a foot under water, then hold it 3 ft under water, at the 3 foot mark you will feel more resistance pushing the balloon upwards towards the surface, same basic principle with a sub.
At least this is my experience playing around with water and stuff as a kid. Don't take my comments and try to explain if I'm right or wrong, I'm simply stating my experience when I was a kid.
@Krauter I love good debates to but I must go to work in 20min and cant debate right now
