As you'll learn very quickly, your exposure suit can be very warm when you're not in the water. If you're not careful, you can overheat and develop heat stroke before your dive begins.

Symptoms of overheating include pale and clammy skin, headaches, fatigue, and nausea. If you develop any of these symptoms, get wet as soon as possible to cool yourself down. If it's not possible to get in the water, remove your exposure suit and allow yourself to cool down.

The best prevention against overheating is timing. Wait to don your exposure suit until your buddy is ready to do the same, and get in the water as soon as possible.