Technical divers today know the rules and procedures but do they know where they came from and why we use them. The first technical divers were cave divers and we were absorbed into the realm of Technical Diving when Mike Menduno coined the phrase "Technical Diving" Do you know where he came up with the term? Do you know when the thirds air rule came about? The idea of redundancy, who were the early trimix divers? Sidemount as we know it today and how did it evolve?