Next, it was time to do technical sidemount. This involves adding our deco 50-percent and 100-percent oxygen tanks on each side. You will have a higher profile underwater, so it is important to keep the tanks as close to your body as possible. There are two clips at each side of the waist. You adjust the tank position by inhaling down your tanks. This is where simplicity is key. You also need to switch between tanks every few minutes. This ensures that the pressure in each tank is at the same level, so even if one tank or regulator fails, there will still be gas for you to breathe. Building up experience is the key to comfort, enjoyment and success with new technologies. The next few days were spent doing sidemount dives, budding up with Evolution coowner David Joyce, a highly experienced Tec diver and Trimix instructor. One dive took us to the Japanese Mogami Wreck at 164 feet. I was captivated by the old gas masks, uniforms, and bones that we found.
Sidemount diving originates in cave diving and has since made its way into recreational, non-overhead dives. Simply put, you'll wear your tanks on the side of your body instead of one or two tanks strapped to your back. The tanks attach to the Sidemount BCD with clips and/or long bungee strings, giving you great flexibility. This flexibility allowed cave divers to get their tanks off the surface to make it fit through narrow spaces.
