Diving support vessel

A diving support vessel is like a really big boat that helps people go underwater. The boat has a special platform that goes into the water and can lift heavy things. This platform is called a "moon pool." People can get into the water from the platform and the boat can give them air to breathe. The people can stay underwater for a long time and do things like fix things on the bottom of the ocean or explore. The boat also has special equipment to help people if there is an emergency.