This chapter includes the following lessons:

In this lesson, you'll learn about the various types of sites you can explore.

Open water environments, whether in the ocean or a fresh water body, are susceptible to changing conditions. This lesson covers the conditions that may exist, how to assess them, and special procedures to follow in their presence.

During this lesson, you'll learn about the life you'll see, potentially hazardous animals that exist, and steps divers must take to protect themselves as well as these fragile organisms.