The Megalodon CCR

Nicknamed the Meg, it is the ISC flagship model. The system has been in production for 8 years and there are over 1000 Meg CCR systems in the field. The Meg has been used all over the world and used as deep as 742ffw/224mfw. The Megalodon CCR has a reputation for reliability and can withstand extreme use.

Meg with available options

The Meg may be integrated with several types of electronic systems, scrubber sizes and types, gas supply cylinders, harness and BC assemblies. There are 21 versions of the Meg to support customer needs. The Meg is being used as a side mounted system for penetration into extreme enclosed spaces and doubled up as a twin system for CCR redundancy for extreme deep diving operations where carrying open circuit bailout is impractical.The ISC Megalodon CCR or more fondly called “The Meg” is a CCR system that has been embraced by divers of all skill levels around the world. Meg divers dive from 60fsw to over 742 fsw/225 msw. With its versatility of design, it can be configured to meet any level of diving and keep pace with the “Meg divers” skill levels.

Fundamentally the Meg was designed for the most demanding dives with consideration for the diver and their needs. Addressing not only the basic requirements of performance that a true 3rd party tested CCR must undergo, but also the other considerations that is not considered, such as travel concerns and conducting repairs in remote locations.

The design of the Meg meets fundamental design requirements established by the creator Leon Scamahorn, Founder and CEO of InnerSpace Systems Corp, in the USA. InnerSpace Systems is an ISO 9001:2008 registered company and the only one like it in the USA at this time. ISC is a custom CCR manufacturing company that designs systems to meet customer requirements.

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Step 1: choose your unit type


Standard Meg with Radial Scrubber ccr rebreather
Scrubber Options:

  • Radial 8.0
  • Radial 5.5
  • 6.0 Axial
The "Standard Meg" gas plenum canister is 17.75" tall and has the most available options with respect to scrubber canister sizes.
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Cave Meg with Raidal Scrubber ccr rebreather
Scrubber Options:

  • Radial 5.5
  • 6.0 Axial
Originally made for the movie, "The Cave," the "Cave Meg" comes with a 15.75" canister. This system is also available with 2 scrubber options.
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Mini Meg with Radial Scrubber ccr rebreather
Scrubber Option: Radial 4.0
The "Mini Meg"can is the for divers wanting shallow, short recreational dives and travels well where weight and space is a premium.
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IMG_CE Meg ccr rebreather
Scrubber Option: Radial 5.5
The CE Meg comes with the 5.5 Lb radial scrubber which provides breathing characteristics to meet the stringent CE standards.
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Cylinder Mounts

Step 2: choose your cylinder mounts
The Shadow mount is an extremely low profile cylinder mounting and accessories fixture that allows cylinders to “hug” the primary breathing system. It also allows for cylinders or accessories to be quickly and repeatability remounted in its desired configuration. Shadow mounts may be welded to the Megalodon CCR gas plenum canister or fixed by compression clamps.

Shadow Welded Non Welded Options
Shadow mounts may be welded to the Megalodon CCR. This option provides for a permanent solution for mounting cylinders to your canister. The non-welded option for shadow mounts is to have them attached with a compression clamp (aka worm drive clamp). This allows versitility if needed.

Cylinder Options

Step 3: choose your cylinder

All cylinders are DOT Approved (North America) - the following cylinder sizes are avilable. For complete specs, click learn more.

  • Faber Steelfaber black
    • 15 cuft (2 liter)
    • 23 cuft (3 liter)
  • Luxfer Alum
    • 13 cuft (2 liter)
    • 19 cuft (3 liter)

Learn More About Cylinders


Step 4: choose your scrubber

ISC Radial Scrubbers

8.0 Radial

5.5 Radial

4.0 Radial

6.0 Axial

Axial Scrubber

The Megalodon axial CO2 scrubber canister is the standard issue canister for non-CE approved Megs.

Learn More About Our Scrubbers

Electronic Options

Step 5: choose your electronics

(click to open)

APECS ElectronicsThe APECS™ family of electronics is used to support ISC closed circuit rebreathing systems. The APECS™ has been in the field for 10 years and is FCC approved and tested the stringent EN 61000 standard. The APECS™ system is designed to be used in a variety of roles to fit the operational needs of the customer.
Shearwater PetrelYou have the option to add to your Meg the Shearwater Petrel dive computer for decompression calculations. ISC recommends having your Petrel with our proprietary connections for PO2 readout on the handset.
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double led hudThe HUD is an independent non-voting truncated based peripheral vision system status indicator that uses a simple blinking and color code to indicate normal operation status and alarm conditions in regard to PO2, and possible water intrusion into the CCR breathing loop.  There are two HUDs options available.

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Step 6: choose your gauge:

Pressure gauges are color coded: Black for diluent, and green for Oxygen.  Gauges are made by Apeks, and are available in your choice of Imperial or in BAR.

PSI (Imperial)

dil pressure gauge

BAR (Metric)

O2 Pressure Gauge in BAR shown.

O2 Gauge BAR


Step 8: choose your backplate

The ISC Travel Backplate

The ISC Travel Backplate

The Megalodon CCR can be placed on any standard diving backplate.  ISC offers several designs and options for our own in house manufactured backplates:

  • Anodized Aluminum
  • Aluminum ILSPEC Hardcoat Black Anodized
  • Travel Plate (3.1 Lbs)
  • SS Backplate (5.5 Lbs)
  • 1/4" Thick SS Backplate (10.5 Lbs)



Pathfinder rebreather ccr Men's Vest System

Step 9: choose your harness

Offered options for our harness systems include:

  • Continuous webbing (Hogarthian)
  • Deluxe Adjustable QR plastic buckles
  • "Old School" Adjustable Harness (non-QR)
  • The ISC Vest System

Download Documents for the Meg Classic