This chapter includes the following lessons:

In this lesson, you'll learn about injuries that can occur as a result of air volume changes in your body's air spaces, how to prevent these injuries, and proper first aid to provide in the event an injury occurs.

This lesson covers decompression sickness, also known as "the bends."

During this lesson, you'll learn how nitrogen affects your mental state, how carbon dioxide controls your breathing rate, how shallow water blackout occurs, and the toxic qualities certain gasses present under pressure.