A navy diver is like a super special kind of underwater superhero who works for the United States Navy. They are highly trained and skilled in swimming and using special equipment to dive really deep into the ocean. They wear a special suit and helmet to protect them from the water pressure and have lots of tools to help them do their job.
When they dive, they might be looking for lost things, inspecting ships and submarines, or even fixing things underwater. They also have to be really good at holding their breath and staying calm because being underwater for a long time can be scary.
Being a navy diver takes a lot of hard work and training, but it's a really important job that helps keep our country safe!