What is the correct way to attach a snorkel while scuba diving? Is it to put it on the left? On the right? Far forward on the mask strap? Farther back? Well, for most scuba divers, the correct answer is none of the above. To understand why, you first need to know a little bit about the history of snorkels and scuba diving — and about some very real drawbacks snorkels have that training agencies seem unwilling to acknowledge.