Streamlining isn’t just a stylistic preference in scuba diving - it’s a philosophy rooted in hydrodynamic logic, safety consciousness, and a deep respect for the underwater world. For divers aiming to develop a competent, efficient, and environmentally conscious practice, understanding and applying the principles of streamlining is a non-negotiable skillset.
At the heart of streamlining lies a trio of benefits: performance, safety, and environmental stewardship. By reducing drag and bulk through proper body positioning and disciplined equipment configuration, a diver conserves breathing gas and energy. This leads to reduced carbon dioxide build-up, lower heart rate, and overall enhanced endurance - a decisive advantage, especially in high-stakes or extended dives.
But streamlining isn’t solely about the diver. Loose or dangling gear increases the likelihood of damaging fragile marine life, from coral structures to kelp forests. It also heightens the risk of entanglement - be it in wrecks, caves, or line-rich environments. Hence, the streamlined diver moves not only with poise but with purpose - protecting themselves, their teammates, and the world they enter.
Let’s now dissect the practical components that form a well-streamlined system.
One of the cornerstones of effective hose management is the 210 cm long hose used in the Hogarthian configuration. This setup isn’t arbitrary - it’s designed for maximum efficiency and safety in both open water and overhead environments. The hose begins at the first stage and follows a carefully considered route: under the right arm, across the chest, over the back of the neck, and finally out over the right shoulder.
- Routing under the left arm, which conflicts with standard deployment techniques.
- Wrapping the hose entirely around the neck, which restricts movement and complicates air sharing.
This specific route not only supports clean deployment during an out-of-gas scenario but also creates minimal profile resistance against the water - exactly what you want when gliding through narrow passageways or delicate marine corridors.
There are two minimalist retention options:
- Waist strap tuck – The excess hose is simply looped under the waist webbing, a clean and intuitive method.
- Canister or tool sheath retention – More advanced divers may choose to secure the hose beneath a canister light or cutting device sheath mounted on the right waist strap.
Both methods ensure that the hose stays close to the body, eliminating loops that could snag or flutter during the dive.
A common oversight in both recreational and technical diving is the poor sizing of the necklace regulator hose. Whether too long (creating unsightly loops) or too short (restricting movement), misconfigured hoses hinder both comfort and function.
- Place the second stage in your mouth.
- Rotate your head fully to the left.
- If there’s a loop over your right shoulder, it’s too long.
- If your head can’t turn fully, it’s too short.
This principle applies whether you’re diving with a single tank, a twinset, or in sidemount. The key is ensuring free head movement without compromising the tidy, close-to-body placement of the regulator.
- Best stored in pockets or attached with boltsnaps to shoulder D-rings, further secured with rubber retainers to avoid dangling.
- Avoid attaching directly to shoulder webbing without a retaining solution - they’ll flop and flutter like antennae, contributing to drag and distraction.
- Mounted on the right side of the waist belt.
- Cable runs across the body, with the light head on the left hand.
- Critically, the cable must run under the long hose - a subtle detail that ensures the long hose can be deployed without entanglement in an emergency.
This arrangement keeps both lighting and air-sharing tools in harmony, never competing for space or creating confusion.
Divers often fall into the trap of clipping accessories to their BCDs like decorations on a Christmas tree - DSMBs, slates, cameras, tools. This is a grave misstep in terms of hydrodynamics and professionalism.
- Use integrated suit pockets or pocket shorts.
- A sidemount butt pouch (yes, even for backmount divers with a minor harness mod) is a last-resort but highly effective solution.
When stowed properly, accessories become invisible until needed. Streamlining is not only about what’s visible, but also what isn’t.
Documentation is vital, but so is presentation. Loose, oversized slates create unnecessary clutter and snag risk.
- Wetnotes: Multiple pages, easily stowed in a pocket. Great for dive plans, gas switches, or observations.
- Wrist slates: Flip-style pages worn beside your computer. Ideal for navigation or rapid communication.
The rule is simple: carry what you need, not what you can.
Sometimes pockets aren’t enough. When you need to clip accessories externally:
- Use the rear crotch strap D-ring.
- Items will lie beneath the cylinder or between your legs - completely out of the flow.
Avoid chest or shoulder D-rings unless the item requires immediate, repeated access (like a stage bottle in technical diving). D-ring abuse is a clear indicator of poor gear discipline.
Every diver needs at least one cutting device. Many technical divers carry two - ideally positioned to be accessed with either hand.
However, restraint is key:
- More than two tools = clutter.
- Overloading your harness turns a streamlined diver into a gear rack.
The focus should always be function over excess. Ask yourself: If I get entangled now, can I access this tool with either hand - blindfolded, stressed, and upside-down?
A hood is often seen as optional in warm water. But for divers with long hair, it's a smart and often overlooked safeguard.
Loose hair:
- Obstructs vision.
- Increases drag.
- Risks entanglement - in gear, lines, or even the first stage.
Wearing a thin hood helps avoid all of the above while also adding a touch of insulation and noise dampening. In other words, a win-win.
Streamlining is far more than an aesthetic - it is an embodiment of thoughtful diving. It reflects a diver’s attention to detail, concern for the environment, and respect for the fluid medium in which they move.
By streamlining your setup:
- You move with grace.
- You signal competence to teammates and observers.
- You become a guardian, not a threat, to the underwater world.
A diver who is truly streamlined understands that excellence underwater is measured not by how much gear you carry, but by how little impact you make while carrying exactly what you need.
