Okay kiddo, let's talk about anti-torpedo bulges. Imagine you're in a bathtub and you want to keep your toy boat from sinking. Maybe, you put a plastic cup upside down in the water to make a little hill for your boat to sit on. That way if you splash around and make waves, your boat won't tip over and sink.
Now, imagine that instead of a toy boat, you're in a giant ship. This ship is traveling across the ocean and has something called an anti-torpedo bulge. This is kind of like the little hill you made for your toy boat, but for a big ship.
The anti-torpedo bulge is a big thick wall made of metal that is attached to the sides of the ship. Its job is to protect the ship from torpedos, which are like big underwater bombs that can be fired at the ship.
Now, the anti-torpedo bulge does something really clever. When a torpedo comes at the ship, the bulge makes the torpedo hit a big thick wall instead of the actual ship. This stops the torpedo from blasting a hole in the ship and causing it to sink.
So, just like your little plastic cup made a hill for your toy boat to sit on, the anti-torpedo bulge protects big ships from torpedos so they can keep sailing across the ocean safely.