Two scuba divers tried to take a selfie to impress their friends — but one of them never surfaced. Learn from the mistakes that led to their accident.

In this installment, Eric Douglas explains the relationship between heart disease risks and waistline, and explains what it's like to be in cardiac rehab.

Can you dive again after open-heart surgery? Author Eric Douglas tells the true story of his heart disease recovery in his latest installment: Lessons Learned.

Diving in caves can be dangerous — even if you've had the right training. Find out why this husband and wife died in an underwater cave system.

Can you dive again after open-heart surgery? Author Eric Douglas tells the true story of his signs and symptoms of heart disease, and his road to recovery.

An experienced but overweight diver couldn't complete a self-rescue, and his body was recovered 10 months later. Learn from his mistake.

Exploring a cave system requires specialized scuba diving lessons — and for good reason. Learn from the mistakes this diver made. It could save your life.

Learn what not to do in an underwater emergency in this Lessons For Life: A diver forgets his training with fatal consequences.

A diver panics and forgets her training after encountering a shark during her dive, and her reaction leads to serious injury.