Well if you read about Anne Frank or read her diary, you notice she is very upbeat and seems to look at even unfortunate things in a bright way. She was rather young at the time so situations such as the one she was in probably didn't register as bad or unfortunate as it would in an adult's mind.
Answer: The choice of a submarine to either sink or float depends on the captain of that submarine. For a submarine to sink the captain just have to allow water to fill the water tank (lock), making the submarine more dense than the water it has displaced. For it to float, it just have to empty the water tank and allow air to fill it.
When a boat in a canal lock sank, the water level will rise, because the volume of the boat has displaced more water, and this displaced water will cause the water level to rise. The space occupied by an object in a water, is equal to the volume of water been displaced.
It made them more important and independent people in society. This was good for them because they needed to act on their own while their husbands and sons were off fighting in a war.
