Motor
Military-grade brushless core
Self-researched patent motor with wear-resistant alloy stator. Runs hard, runs cool, and shrugs off the vibration a day on the water throws at it.
The BlueDepth S9
Dive longer. Breathe freely.
4.8 · 428 reviews
$99$129Launch pricing
Every kit ships with a spare battery, a second regulator, and a hard travel case. Order more units, save more.
- Spare battery
- Second regulator
- Hard travel case
Free worldwide shipping30-day returns2-year warranty
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BlueDepth S9 · Surface-supplied
Dive longer. Breathe freely.
Continuous surface air — no tanks, no weight, no limits. Down to 29 meters, on one rechargeable battery, straight off the beach.
4.8 rating2,300+ diversShips in 24h
No heavy tanks
Leave the cylinders, the weight belt, and the compressor runs behind. The S9 floats above you while you swim light.
Up to 9 hours underwater
One charge of the lithium battery keeps steady airflow going for up to 9 hours underwater — a full day of diving on a single pack. Swap batteries and keep the week open.
Set up in minutes
Unfold, drop the float, clip on the regulator, walk into the water. No dive shop, no fills, no waiting.
How it works
Three steps between you and the reef.
- 01
Float the unit
Drop the S9 on the surface above you. The bright red foam keeps it visible from any boat.
- 02
Air flows down the hose
A quiet compressor pushes filtered air through 12 meters of anti-kink coiled hose, straight to your regulator.
- 03
Dive up to 29 m
Breathe naturally, swim light, and stay down as long as the battery — and your buddy — allow.
The core
Continuous surface air, no cylinders.
A brushless compressor sits on the surface and pushes clean, filtered air straight to you. No pressure gauges to watch, no reserve to stress about — just steady, quiet breathing.
Power
A battery that lasts all day.
The hot-swappable lithium pack delivers up to 9 hours of continuous air underwater per charge, depending on depth and temperature. Carry a spare and turn a weekend into a whole week of diving.
Under the hood
Engineered part by part, for salt and depth.
Every component earns its place. Here's what's inside the shell you'll be trusting with your breath.
Electronics
Automotive-grade control chip
The same class of silicon that runs modern vehicle safety systems, watching pressure, temperature, and battery health every millisecond you're breathing off it.
Housing
Certified diving ventilator
Carbon-fiber deck, closed-cell buoyancy collar, aluminum sub-frame. Engineered as a ventilator first, a float second — several patents underneath the paint.
Stability
Self-righting in two seconds
Weighted keel and non-invertible hull geometry. If a wave flips it, it snaps back upright before you've taken your next breath.
Perfect for
One unit. A hundred reasons to get wet.
Ideal for a wide variety of underwater activities.
Recreational Diving
- Exploring reefs
- Coastal diving
- Family diving trips
- Vacation adventures
- Underwater sightseeing
Spearfishing
- Longer hunting sessions
- Reduced equipment weight
- Increased mobility underwater
Underwater Photography & Videography
- Extended filming time
- Stable breathing for better camera control
- Marine wildlife photography
Boat & Yacht Maintenance
- Hull inspections
- Cleaning marine growth
- Propeller inspection
- Zinc anode replacement
Pool Maintenance
- Deep pool cleaning
- Underwater repairs
- Commercial pool inspections
Underwater Inspection
- Dock inspections
- Marina maintenance
- Bridge support inspections
- Floating platform checks
Scientific & Marine Research
- Marine biology studies
- Coral observation
- Environmental monitoring
- Water sampling
Treasure Hunting
- Metal detecting
- Recovering lost items
- Lake and river exploration
Underwater Harvesting
- Shellfish collection
- Sea cucumber harvesting
- Lobster collection
- Seaweed harvesting
Specs
The numbers, honestly stated.
No inflated marketing depth ratings. What we test at, we print.
- Max depth
- 29 m / 95 ft
- Air supply
- Continuous, surface-supplied
- Battery
- Rechargeable lithium, hot-swappable
- Runtime
- Up to 9 hours underwater per charge
- Hose length
- 12 m / 40 ft coiled
- Water rating
- Salt and freshwater
- Frame
- Anodized aluminum, 316 stainless
- Weight
- 8.2 kg / 18 lb
- Handle
- Integrated marine-grade carry handle
- Compressor
- Twin-piston, dampened, near-silent
In the box
Everything you need. Nothing you don't.
Every S9 ships ready to dive. Save the box — it doubles as a great travel case.
- S9 float unit
- 12 m coiled hose
- Lithium battery
- Universal charger
- Regulator
- Connection kit
- Printed manual
Reviews
What divers actually say.
4.8·428 verified reviews
Verified buyer
Cleaned my hull without a dive shop in sight
I spent an entire afternoon under the boat scraping barnacles with the S9 above me. Two battery swaps, no fatigue, no cylinder refills. Best purchase for a boat owner this year.
Verified buyer
Reef dives in the Red Sea, no logistics
We took it out over a shallow reef near Giftun. Sat at 8–12 m for close to an hour. My wife has never wanted to try scuba because of the tanks, and she went in on her second morning.
Verified buyer
9 hours of runtime is no joke
Build quality is genuinely impressive and the compressor is much quieter than my old hookah. I got a full afternoon at 12 m on one battery and still had charge left. Bring the spare on longer trips and you're set for days.
Verified buyer
Underwater photography finally feels natural
No cylinder on my back means I can hold a camera rig in both hands and not spook the fish. The hose stays out of frame if you're careful. Genuinely changed how I shoot.
Verified buyer
Setup in five minutes, off the beach
Walked in from the shore, unfolded it, dropped the float, went down. My previous compressor took a car battery, extension leads, and half a morning of swearing.
Verified buyer
Recovered my dad's watch at 18 meters
Long story, sandy bottom, clear water. Took me two dives. Nobody rents this kind of gear here on short notice, so owning it saved us. It's already earned its price.
S9 vs traditional scuba
A different tool for a different day.
The S9 doesn't replace a scuba rig for wreck penetration or 40 m walls. For every shallow-water dive most of us actually do — reef, hull, spearfishing, photography — it's a lighter, faster answer.
| Consideration | BlueDepth S9 | Traditional scuba |
|---|---|---|
| Weight in the water | 8 kg unit floats | 18–25 kg on your back |
| Setup time | Under 5 minutes | 20–40 minutes |
| Refills needed | None — it's a battery | Every 45–60 min |
| Typical dive time | Battery-limited (up to 9 hours) | Tank-limited (30–50 min) |
| Cost per year (10 dives) | ~ $60 (charging) | ~ $250 (air + rentals) |
| Depth | 0–29 m | 0–40+ m (with certification) |
Questions divers ask
Straight answers, safety-first.
No license is legally required in most regions for surface-supplied shallow-water diving, but we strongly recommend a basic open-water course or a hookah-diving orientation before your first descent. Understanding equalization, buddy signals, and safe ascent rates keeps the experience calm and enjoyable.
The S9 is rated to 29 m (95 ft) with the standard 12 m hose configuration. Most divers spend their time between 3 and 15 m — where the light is best and the reef is alive. Never push past the rated depth, and always follow safe ascent rates.
Up to 9 hours of continuous air underwater at moderate depth, depending on temperature, breathing rate, and depth. Every kit ships with a hot-swappable spare battery, so you can extend a multi-day trip without heading back to shore.
Yes. The housing, hardware, and internal air path use marine-grade, corrosion-resistant materials. After each salt-water session, rinse the unit with fresh water and let it dry in the shade. Simple care, long life.
Two years, worldwide, on the compressor, battery, and electronics. Wear items — hose, o-rings, mouthpiece — are covered for 6 months. Full details on the Warranty page.
Orders placed before 2 pm CET ship the same day from our warehouse in Marseille. Standard delivery is 3–6 business days worldwide with tracked, insured shipping. Free on every order.
Yes — the S9 Pro Bundle includes a second regulator and Y-splitter. Two divers can share air at reduced individual duration. For serious two-diver work, we recommend the S9 with a second battery rather than pushing a single charge.
You should be a confident swimmer and comfortable in open water. If you've never used breathing equipment underwater, spend your first sessions in a pool or a calm, shallow cove. Always dive with a buddy on the surface, never exceed 29 m, and take breaks between long sessions.
30-day open-water guarantee
Dive it. If it's not for you, send it back.
A month of real water. Free returns, no forms, no restocking fees. If the S9 doesn't earn a place in your kit, we refund every dollar.