That is right. No one is suppose to throw trash in the water or on land. It isn't good for the animals, the environment, or us humans. Polluting the earth isn't good for anybody and Islam says we should always take care of our environment. So, then you get out of your submarine, get rid of all of the trash, and you save the dolphin.
Who was the Christian monk who said Prophet Muhammad was going to be the Messenger of Allah when he grew up?