The Prism 2 is a fully closed circuit Rebreather, ideal for exploring open ocean, cave, or wrecks. This unit can be electronically or manually controlled which means you choose how you want the loop PPO2 maintained.

Includes shoulder mounted counter lungs and rear mounted radial scrubber which provide easy breathing with low resistive effort and low hydrostatic loading. The Prism 2 has also been tested by ANSTI at 100M and has the lowest WOB of any mixed gas CCR on the market at 0.94 J/L.

The standard kit includes an electronic secondary control and primary LED displays with a backplate/wing assembly that provides a complete kit ready to dive out of the boxs. Tanks and valves are purchased separately.



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QC Scuba
(3282 Sunrise Hwy, Wantagh, NY 11793, USA)
Island Divers Cozumel
(Centro, San Miguel de Cozumel, Q.R., Mexico)
Ocean Safari Scuba
(125 E Las Tunas Dr, San Gabriel, CA 91776, USA)
(San Pedro Sula, Honduras)
Aventuras Submarina
(Cra. 102 #15-163, Cali, Cali, Valle del Cauca, Colombia)
Poseidon Dive Center
(Cra. 18 #1-69, Santa Marta, Santa Marta, Magdalena, Colombia)
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Xpro Diver
(Avenida Río de Janeiro, Caracas, Venezuela)
Nijusseiki Corp
(Minamiaoyama, Minato, Tokyo 107-0062, Japan)
Silent World Diving Systems
(13433 NE 20th St, Bellevue, WA 98005, USA)
Dive On It
(23 Narragansett Avenue, Jamestown, RI 02835, USA)
Scuba Shack TN
(4113 Old Hickory Boulevard, Old Hickory, TN 37138, USA)
Cave Adventurers
(5211 Limestone Lane, Marianna, FL 32446, USA)
Brownies Palm Beach Divers
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Brownies Southport Divers
(1530 Cordova Road, Fort Lauderdale, FL 33316, USA)
Brownies Yacht Toys
(2301 South Federal Highway, Fort Lauderdale, FL 33316, USA)
Sydney Dive Academy
(1/460 Bunnerong Road, Matraville NSW 2036, Australia)
Carmel Bay Divers LLC
(5859 Winfield Boulevard, San Jose, CA 95123, USA)
Shipwreck Adventures
(2004 Washington Street, Two Rivers, WI 54241, USA)
Deep Tourism & Watersports LTD
(Eilat, Israel)
East Coast Divers
(213 Massachusetts 9, Brookline, MA 02445, USA)
Signature Scuba
(11955 Jack Benny Drive, Rancho Cucamonga, CA 91739, USA)
San Diego Divers
(11211 Sorrento Valley Road, San Diego, CA 92121, USA)
Dive Station
(3465 Edgewater Drive, Orlando, FL 32804, USA)
Jupiter Dive Center
(1001 Florida A1A Alternate, Jupiter, FL 33477, USA)
Dive Services Inc.
(228 Matt Lane, Virginia Beach, VA 23454, USA)
Ocean Quest Adventures
(17 Stanleys Road, Conception Bay South, NL A1W 5H7, Canada)
Adventures in Scuba
(9950 Macleod Trail Southeast, Calgary, AB T2J 3K9, Canada)
Nanaimo Dive Outfitters
(2205 Northfield Road, Nanaimo, BC V9S 3C3, Canada)
Pacific Pro
(2270 Cliffe Avenue #101, Courtenay, BC V9N, Canada)
OKÉ Plongée
(9150 Rue Claveau, Montreal, QC H1J, Canada)
Aquanauts Grenada
(True Blue, Grenada)
The Dive Outfitters
(17826 107 Avenue Northwest, Edmonton, AB T5S 1J1, Canada)
Maximum Scuba - Mammoth Lake
(330 North Dixie Drive, Lake Jackson, TX 77566, USA)
Tacoma Scuba
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Seal Sports
(2213 North Causeway Boulevard, Mandeville, LA 70471, USA)
New England Dive (Wallingford)
(476 North Colony Street, Wallingford, CT 06492, USA)
Micronesian Divers Association
(Marine Corps Drive, Guam)
Lone Star Scuba Inc. (Fort Worth)
(2815 Alta Mere Drive, Fort Worth, TX 76116, USA)
The Great American Diving Company
(122 North 5th Street, St. Charles, MO 63301, USA)
(614 D Street, South Charleston, WV 25303, USA)
Dive Station
(3465 Edgewater Drive, Orlando, FL 32804, USA)
Dive Right In Scuba
(24222 West Lockport Street, Plainfield, IL 60544, USA)
Dive Addicts
(12356 South 900 East, Draper, UT 84020, USA)
Argentina Diving
(El Rodeo 479, Francisco Alvarez, Buenos Aires Province, Argentina)
(Evansville, IN 47715, USA)
Add Helium
(4530 Arnold Avenue, Naples, FL 34104, USA)
(11 39th Place, Long Beach, CA 90803, USA)
Seahorse Diving
(3191 Old Lincoln Highway, Gap, PA 17527, USA)
Breakwater Scuba
(225 Cannery Row, Monterey, CA 93940, USA)
DiveTech LTD.
(571 N W Point Rd, West Bay KY1-1206, Cayman Islands)
Xplore Scuba
(1046 Regent Pkwy #105, Fort Mill, SC 29715, USA)
Wallin's Dive Center
(San Mateo, CA 94403, USA)
Wakulla Diving Center
(2784 Coastal Hwy, Apalachicola National Forest, Crawfordville, FL 32327, USA)
Wet Place (Distribuidor)
(Av. Dom Luís, 300 - Meireles, Fortaleza - CE, 60160-230, Brazil)
Virginia Scuba
(6884 Wellington Road, Manassas, VA 20109, USA)
Underwater Connection
(5300 South 108th Street, Hales Corners, WI 53130, USA)
Underwater Connection
(16459 W Appleton Ave, Menomonee Falls, WI 53051, USA)
Uncle Joe's Scuba
(937 5th Ave, Coraopolis, PA 15108, USA)
(2440 Cliffe Avenue, Courtenay, BC V9N, Canada)
ToucanDive, Inc
(756 Frontage Rd, Lake Villa, IL 60046, USA)
The Scuba Connection
(856 US-206, Hillsborough Township, NJ 08844, USA)
Add Helium
(3590 Northwest 54th Street #1, Fort Lauderdale, FL 33309, USA)
(844 51 St, Saskatoon, SK S7K, Canada)
Texan Scuba @ The Blue Lagoon
(649 Pinedale Rd, Huntsville, TX 77320, USA)
Tacoma Scuba Center Llc
(1602 Center St, Tacoma, WA 98409, USA)
Tackle Shack Watersports Inc
(7801 66th Street North, Pinellas Park, FL 33781, USA)
Lone Star Scuba
(2815 Alta Mere Drive, Fort Worth, TX 76116, USA)
Spruce Creek Scuba
(1646 Taylor Rd, Port Orange, FL 32128, USA)
Splash Water Sports, Inc
(2905 Banksville Rd, Pittsburgh, PA 15216, USA)
Blue Octopus
(4154 Duke Street, Alexandria, VA 22304, USA)
Seascapes USA
(295 Robbins Ln, Syosset, NY 11791, USA)
Seal Sports
(2213 N Causeway Blvd, Mandeville, LA 70471, USA)
Scuba Toys
(1609 S Interstate 35e, Carrollton, TX 75006, USA)
(409 Rue Notre-Dame, Repentigny, QC J6A 2T2, Canada)
(4420 Holt Blvd, Montclair, CA 91763, USA)
Scuba Quest
(106010 Overseas Hwy, Key Largo, FL 33037, USA)
Scuba Quest
(8092 S Orange Blossom Trail, Orlando, FL 32809, USA)
Scuba Quest
(5770 S Tamiami Trail, Sarasota, FL 34231, USA)
The Great American Diving Company
(11125 Manchester Road, Kirkwood, MO 63122, USA)
Scuba Quest
(3318 Manatee Ave W, Bradenton, FL 34205, USA)
Scuba Quest
(37 Del Prado Blvd N, Cape Coral, FL 33909, USA)
Scuba Quest
(S Tamiami Trail, Sarasota, FL 34236, USA)
Scuba Quest
(1553 N Lime Ave, Sarasota, FL 34237, USA)
Scuba Network (Deerfield)
(959 S Federal Hwy, Deerfield Beach, FL 33441, USA)
Scuba Marco
(1141 Bald Eagle Dr, Marco Island, FL 34145, USA)
(7714 Castor Ave, Philadelphia, PA 19152, USA)
Dive Gear Express
(4100 North Powerline Road #1, Pompano Beach, FL 33073, USA)
Scuba Center
(5015 Penn Avenue South, Minneapolis, MN 55419, USA)
Scuba Center
(1571 Century Point, Eagan, MN 55121, USA)
Motor City Scuba
(40001 Grand River Ave, Novi, MI 48375, USA)
Sam's Skin N Scuba LLC
(9300 East 35th St S, Independence, MO 64052, USA)
Stuart Dive Shop
(3317 Southeast Federal Highway, Stuart, FL 34997, USA)
Reef Divers
(262 Charles Street, Pretoria 0011, South Africa)
Pura Vida Divers
(2513 Beach Ct, Riviera Beach, FL 33404, USA)
Puerto Rico Technical Diving Center
(Aguadilla, 00603, Puerto Rico)
Pisces School of Dive, Inc.
(783 Fairport Rd, East Rochester, NY 14445, USA)
Argentina Diving (Distribuidor)
(Av. del Libertador 7766, C1429BMX CABA, Argentina)
Deep Stop Scuba
(Camillus First Baptist Church, 23 Main Street, Camillus, NY 13031, USA)
Dive On It
(910 Mendon Road, Cumberland, RI 02864, USA)
Oceanic Africa
(6001, South Africa)
(3790 Canada Way, Burnaby, BC V5G 1G6, Canada)
Ocean Legends Hawaii
(1130 N Nimitz Hwy, Honolulu, HI 96817, USA)
(6815 104 St NW, Edmonton, AB T6H 2L6, Canada)
Northeast Scuba Supply, Inc.
(919 N Trooper Rd, Norristown, PA 19403, USA)
New England Dive Center
(476 N Colony St, Wallingford, CT 06492, USA)
Neptunes Realm Scuba Center
(946 Lake Rd #304, Avondale, PA 19311, USA)
Narcosis Scuba Center
(926 N Pinellas Ave, Tarpon Springs, FL 34689, USA)
Guadalajara Dive Center
(Calzada Lázaro Cárdenas 1796-C LOCAL, Jardines de San Ignacio, 45040 Zapopan, JAL, Mexico)
Micronesian Divers Assn., Inc.
(Marine Corps Dr, Tamuning, Guam)
MBT Dive and Surf
(3920 Barrancas Ave, Pensacola, FL 32507, USA)
Maximum Scuba - Seabrook
(2001 Bayport Blvd, Seabrook, TX 77586, USA)
Maximum Scuba Houston
(6423 Richmond Ave, Houston, TX 77057, USA)
Lighthouse Diving Center
(5421 196th St SW, Lynnwood, WA 98036, USA)
Kona Diving Company
(74-5615 Luhia Street, Kailua-Kona, HI 96740, USA)
International Scuba
(2540 Marsh Lane #128, Carrollton, TX 75006, USA)
Inland Water Divers
(13220 W Van Buren St, Goodyear, AZ 85338, USA)
Horizon Divers
(105800 Overseas Hwy, Key Largo, FL 33037, USA)
Hollywood Divers
(3575 Cahuenga Blvd W, Los Angeles, CA 90068, USA)
Hampton Dive Center
(369 Rte 24, Riverhead, NY 11901, USA)
Gone Diving
(1740 Iowa St, Bellingham, WA 98229, USA)
Gigglin' Marlin Dive & Swim
(4502 Almeda Rd, Houston, TX 77004, USA)
(155 E Blue Heron Blvd, Riviera Beach, FL 33404, USA)
(2621 N Federal Hwy, Boca Raton, FL 33431, USA)
(1312 N Federal Hwy, Pompano Beach, FL 33062, USA)
Ez Scuba Diving Inc
(7711 West Hillsborough Avenue, Tampa, FL 33615, USA)
Elmer's Watersports, Inc
(1310 Oakton St, Evanston, IL 60202, USA)
El Mar Diving Center
(2245 W Broadway Rd, Mesa, AZ 85202, USA)
Eco Dive Center
(4027 Sepulveda Blvd, Culver City, CA 90230, USA)
Duggan Diving Enterprises
(928 Coronado Blvd, Universal City, TX 78148, USA)
Divers Incorporated
(3380 Washtenaw Ave, Ann Arbor, MI 48104, USA)
Patriot Dive Center (NC)
(829 South Kerr Avenue, Wilmington, NC 28403, USA)
Diver Dan's, Inc.
(2245 El Camino Real, Santa Clara, CA 95050, USA)
Dive Right In Scuba Inc
(24222 W Lockport St, Plainfield, IL 60544, USA)
Add Helium - Pompano Beach
(101 North Riverside Drive #121, Pompano Beach, FL 33062, USA)
Dive Locker
(106 Thomas Dr, Panama City Beach, FL 32408, USA)
Dive Addicts Inc.
(12356 S 900 E, Draper, UT 84020, USA)
Coral Edge Adventures LLC
(4657 Sudley Rd, Catharpin, VA 20143, USA)
Copper Island Diving LTD.
(271 Trans-Canada Highway, Salmon Arm, BC V1E 3B8, Canada)
(705 NW Santa Fe Blvd, High Springs, FL 32643, USA)
Carolina Dive Center
(5540 Atlantic Springs Rd #112, Raleigh, NC 27616, USA)
Pacific Scuba Divers
(1179 E Homestead Rd, Sunnyvale, CA 94087, USA)
Island Divers-Schofield
(Ulrich Way, Schofield Barracks, HI 96857, USA)
Blu Water Scuba LLC
(9352 Mike Garcia Dr, Manassas, VA 20109, USA)
Langley Diving
(20055 Willowbrook Drive #301, Langley, BC V2Y 2T5, Canada)
Beach Cities Scuba
(Valley View St, Cypress, CA 90630, USA)
Beach Cities Scuba
(34283 Pacific Coast Hwy, Dana Point, CA 92629, USA)
Aquatic Sports
(10803 SW Barbur Blvd, Portland, OR 97219, USA)
Aquatic Scuba Adventures
(1363 Laclede St, Sheridan, WY 82801, USA)
Aquatic Obsessions
(6193 Central Ave, St Petersburg, FL 33710, USA)
Aquatech Dive Center (IN)
(2100 S Weinbach Ave, Evansville, IN 47714, USA)
Anchor Shack
(5775 Pacheco Blvd, Martinez, CA 94553, USA)
Anacortes Diving & Supply
(2502 Commercial Ave, Anacortes, WA 98221, USA)
Air Hogs Scuba
(21 Anna Dr, Clayton, NC 27520, USA)
AUP - Hawaii
(905 Kalanianaole Highway, Kailua, HI 96734, USA)
BlackJack Tech Diving
(11815 U.S. 15, Aberdeen, NC 28315, USA)
Adirondack Scuba
(98 Rowland St, Ballston Spa, NY 12020, USA)
Academy Of Scuba
(8502 N Black Canyon Hwy, Phoenix, AZ 85051, USA)
Dive Gear Express
(4100 North Powereline Road STE E-1, Pompano Beach, Florida 33073)



The PRISM 2 is an electronically or manually controlled, constant PO2, modular, closed circuit diving system.

As open circuit (SCUBA) divers we rely upon filling our lungs with air from a pressurized gas tank with every inhalation and then exhausting that volume of air into the surrounding water with every exhalation. As we descend deeper the water pressure around us increases and the volume required to fill our lungs increases; in other words, our air supply depletes more quickly the deeper we dive.

A rebreather recycles rather than vents the exhaled breath. The exhaled breath passes into a closed loop, where it is pushed through a chemical absorbent (scrubber) to remove the carbon dioxide, and returns through the other side of the loop for the diver to re-breathe, hence the name “closed circuit rebreather” or CCR.

It’s breathing loop which is a keyed one way assembly consists of a closable mouthpiece assembly with mushroom/check valves either side, which ensure uni-directional flow.

Independent 3rd party testing has also rated the Prism 2 the lowest work of breathing of any mixed gas rebreather available today at 0.94J/L. Click here for actual test reports: ANSTI_Prism2WOB_review.pdf

Status check

With the electronics switched on, the secondary also provides a status check for the battery and displays the set point selected for the dive along with other critical information. The electronics vote between the three proprietary galvanic sensors and control the operation of a low wattage solenoid valve on the oxygen supply.

Scrubber design

A radial flow scrubber canister is mounted vertically on a backplate attached to the integrated BC, between twin supply cylinders (one each, oxygen and diluent).


The electronics, sensors and batteries are mounted in the electronics head assembly at the top of the scrubber, with supply hoses feeding over the diver’s shoulders into the top of the counterlungs. An analog LED primary display offers a quick reference of unit performance with status and alarm indicators while an independent digital OLED secondary display verifies the unit’s performance.

Counter lungs

Dual, front mounted counterlungs provide the diver with a flexible reservoir equivalent to the maximum displacement of the diver’s own lung volume and ensures the lowest possible hydrostatic loading.

These counterlungs are fitted with both automatic and manual gas addition systems and a variable volume control valve (used upon ascent to vent excess expanding gas volume or to purge the loop). Diluent addition is automatically achieved as hydrostatic pressure increases and the counter lung collapses against the valve actuator.

Secondary Display (COMPUTER)

The Shearwater Petrel 2 is the computer display on the Prism 2 and was chosen for this application as it is one of the most advanced mixed gas CCR computers available today. The Petrel 2 is designed to control the Prism 2 setpoint and uses a basic decompression algorithm known as Buhlmann ZHL-16C which has been modified by the use of gradient factors.

  • Depth, time and oxygen sensor display
  • Bühlmann decompression model with gradient factors conservatism
  • Optional VPM-B decompression model
  • Imperial and metric displays
  • DiveCAN communications for robust connections to rebreathers
  • A menu system that adapts to diving status
  • Automatic turn off after 15 minutes on the surface
  • Depth sensor rated to 450 feet/140 meters of seawater
  • Dive Planner
  • Any combination of oxygen, nitrogen, and helium (Air, Nitrox, Trimix)
  • Open and closed circuit, switchable during a dive
  • 5 CC and 5 OC gases
  • Gases can be changed and added during a dive
  • CNS tracking
  • No lockout from violating deco stops
  • Automatic PPO2 set-point switching (configurable)
  • Two PPO2 set-points, each of which can be set between .5 and 1.5
  • Flexible user replaceable battery. Almost any ‘AA’ type
  • Tilt compensated digital compass (Petrel 2 only)
  • 1000 hour dive log memory
  • Log downloads and firmware upgrades using Bluetooth

The Primary Display (HUD) is a Shearwater DiveCAN Heads-Up Display mounted on either the right or left side of the DSV/BOV mouthpiece just below eye level. Each HUD provides a status indicator for its corresponding O2 sensor by using a “Smithers Code” flashing the status on a cycling 5-second loop during the dive.

  • PPO2 display from 3 oxygen sensors.
  • Modified Smither’s code blink pattern.
  • Bright light emitting diodes with vibrant colors.
  • Color-blind blink pattern (optional setting).
  • Wet contacts for automatic turn-on.
  • Option to flip orientation – can be positioned on either side of the rebreather mouthpiece.
  • DiveCAN® communications interface for robust data transmission and easy upgrades, disassembly and repairs.
  • Bright red end-cap LED for buddy warnings.
  • Automatic brightness control optimizes viewing in all conditions.
  • Red color only used for unsafe PPO2 warnings.

  • Shoulder mounted counterlungs provide easy breathing with low hydrostatic loading
  • Lowest Work of Breathing in industry at 0.94 J/L – Tested at 100M by ANSTI
  • Unit weight when fully charged, in standard
    configuration – approx. 47lbs
  • 3.5 Liter split counterlungs allows inhale and exhale counterlungs for high work loads
  • Counterlung drains make it easy to remove water during a dive
  • All gas lines external to the breathing loop prevents leaks from affecting the PPO2
  • Automatic diluent addition valve adds diluent during descent or when the loop volume is low
  • Manual diluent addition valve adds on board or off board diluent for loop flushing
  • Gases – Air, Trimix, and Heliox
  • Manual oxygen addition valve allows for manually controlling oxygen PPO2
  • High performance open circuit Bail Out Valve option
  • Integral harness and BC or
    Backplate standard makes the Prism 2 ready to dive out of the box
  • Full range of wings/harness gives the ultimate customization
  • Accepts 13, 19, or 30 cu.ft. cylinders for flexible gas management
  • Eye level LED Primary display provides easy to monitor system status
  • Displays PPO2 for each oxygen sensor is used to control PPO2 manually & assure electronics system is nominal
  • External power switch is easy to power on
  • Easy calibration with a push button O2 calibration
  • Large OLED Secondary Display is easy to read, even for your buddy
  • PPO2 Monitoring of Three Sensors Continuous display of each sensor’s PPO2, mv reading easy to access
  • Closed Circuit & Open Circuit, 5 gases supports diluent switching & Multi-gas mix dive plans
  • 2 button push OC bailout – If you have to leave the loop, quickly switches to bailout support
  • CNS Tracking based on real time
    oxygen exposure
  • Software Update via web
  • Dive Log download an


Length 21in (53.3 cm)
Width 17 in (43.2 cm)
Depth 9 in (22.9 cm)
Buoyancy Neutral
Weight Approx. 47 lbs with tanks
Scrubber Flow Design Radial
Counterlungs Over the shoulder
PO2 set points adjustable (0.7, 1.0, 1.2, 1.3, 1.4)
O2 sensors 3 galvanic
Sensor life 12 months in air or 100 hours dive time
Heads Up Display Yes, 9V battery powered sequential LED
Handset Yes, (Shearwater Petrel) powered by Lithium cell
Battery type 9 volt Alkaline / 3.6V Lithium cell
battery life 40 hrs
automatic setpoint switch Yes
integrated weight system Yes (Optional)
scrubber duration 245 min @ (60 fsw, 40F, 1.3L/min CO 2,0.5%CO 2 SEV)



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