You can read these principles a hundred times. Success is verified only in the water. Use this checklist before your next dive:
| Principle | Pass/Fail Criteria | Verified State | | :--- | :--- | :--- | | Weight Distribution | You can doff/don rig in 10 ft of water without rolling. | Lead is on spine plate. | | Arc of Cylinder | Tanks slide to armpit without hand pressure. | Hip ring is 2" behind hip bone. | | Two-Touch Drill | You locate left post valve in 3 seconds blindfolded. | Hand drags tank body. | | The Trap | No hoses hang below waist or float above head. | All regs bungeed or magnetized. | | Asymmetric Buoyancy | Hover 60 seconds with left tank off. | Wing is completely empty. | | Ben's Curve | Hose forms an "S" under armpit. | No ear-tickling on head shake. | | Decanting Protocol | End psi within 200 psi per tank. | Equalized every 20 min. |
If your hands are holding you in place, you are not in control. sidemount principles for success verified
Success in sidemount diving comes from a combination of proper training, thorough equipment knowledge, and adherence to established diving principles with a focus on buoyancy control, emergency preparedness, and staying within your limits. With practice and patience, sidemount diving can offer a new dimension of exploration and enjoyment in the underwater world.
The most overlooked principle in sidemount is gas management symmetry. You cannot succeed with a full right tank (3000 psi) and a half-empty left tank (1500 psi). The weight imbalance will flip you upside down in a restriction. You can read these principles a hundred times
The Verified Rule: You must decant (equalize) your tanks at the start of every dive, and every 20 minutes thereafter.
The Procedure:
Verification: A successful sidemount dive ends with both cylinders reading within 200 psi of each other. If one tank is empty and the other has 800 psi, your decanting discipline is broken. You are not trimmed; you are a pendulum.
Verified Truth: If your tanks are not parallel to your spine and floating off your hips, you are fighting the water. The most overlooked principle in sidemount is gas
In sidemount, the cylinders should run from your armpit (valve) to your hip (boot), parallel to your torso. The most common failure is having the tanks roll outward (valves splaying apart) or sink below the hip, creating massive drag.
The Fix: Adjust your cylinder bands so the center of gravity of the tank sits slightly behind your hip bone. Use a bungee loop (necklace) or a roller clip at the shoulder to pull the valve into your armpit. When in trim, your tanks should feel like they are glued to your lats. If you can slide a hand between your tank and your ribcage, you have failed.