I am glad that you did not get hurt, but that Captain did have a good question. I was kind of wondering the same thing. I asked my friend Phoebe. She told me that God made the heavens ant the earth and he even made sharks. He did that on purpose none of it was an accident.
Sharks are a very important part of the balance in the ocean.
All of the creatures and plants that live down there have a special job. They have to live and grow and eat to keep things down there in order. If there were no sharks in the ocean there would be too many fish and the fish would eat too much and cause other plants and animals to die. It is part of God's plan to keep the system working under the water. It is actually quite a complicated system which is sometimes called a balance.