Archimedes Principle and Buoyancy

Think of a scuba diver who has just jumped into the water.

How can that diver stay underwater for long periods of time without being pushed upwards by the buoyant force?  How is neutral buoyancy maintained? 

You may already know these answers. If not, that is okay. You will learn the answer to these questions in this topic so that you can use this information in planning your diving trip.