Hollis Explorer



Rebreathers are quite simply, the future of diving. They allow for extended dive times and an interaction with the aquatic environment that cannot be witnessed while on open circuit systems. Unlike open circuit, rebreathers recycle exhaled gas allowing for optimised use of the gas that is carried by the diver. Because of this, there is a minimal amount of bubbles exhaled, thereby allowing an interaction with fish life that is seldom, if ever, encountered on open circuit. The Hollis Explorer Electronic Semi Closed Rebreather is designed for the sport recreational market 0 - 40 metres/132 feet.

The unit design is a fully automatic semi closed circuit electronic system requiring minimal user input underwater and with the concept that if there is a problem the diver switches over to open circuit bailout gas and simply ascends.

This unit is targeted for the recreational market, so that many more divers may have the benefits of closed circuit diving without the advanced training that is generally required for other technical closed circuit systems.

Much like the Hollis Explorer being a unique rebreather, so is this RAID program. Divers are introduced to the benefits of the Hollis eSCR (Electronic Semi Closed Rebreather) system via a bespoke, specific academic manual. In addition to this there are specific Confined and Open Water manuals outlining specific safety skills needed to operate the Hollis Explorer enjoyably. There is nothing generic about this program, it is all about this one rebreather. As is the norm with RAID, we have again pushed the boundaries of diver education and Instructors can now conduct the RAID Hollis Explorer program for those who have never dived before as well as experienced divers.


Raid rebreather training is unique since it uses a system whereby divers can progress easily through a training system similar to most recreational open circuit systems. RAID is the only training agency that offers complete training for recreational rebreather divers. From learning to dive to instructor and beyond. To make a system like this work, it must cater for different rebreathers and the training needed to safely dive them. In order to do this, you will need to participate in a ‘Specialty' and 'Core Level' when beginning RAID rebreather training. If you desire to further your education you will not need to complete the specialty again, only then next level of training.


The minimum age for participation is 18 years old when training commences.

A non certified diver wanting to learn to dive this unit specific rebreather and enter the RAID training program needs to complete the Hollis Explorer Diver Specialty and the Level one rebreather core level training. This will certify you as an equivalent to an Open Water 20 diver on rebreather. The maximum depth for certification is 20 metres/66 feet. As your experience increases you may progress through the further core levels.

A certified open circuit diver wanting learn to dive this rebreather can enter the RAID training program at either Level 2 or Level 3. Level 2 is the equivalent of an Explorer 30 Diver and certifies you as a diver to a maximum of 30 metres/99 feet. The Level 3 program combines Master Rescue diver with the Deep 40 specialty allowing you to dive to a maximum of 40 metres/ 132 feet.

RAID certified rebreather divers wanting to extend their abilities can participate in further core level diver training once they have the experience to do so.

Note: A RAID rebreather certification is not a dual certification, whereby the diver recieves certification for CCR and open circuit.

For full details please contact your RAID DIVE CENTRE.

To register as a RAID diver, please click here

To begin your RAID Hollis Explorer journey, click here

Watch what Nick Hollis, CEO of Hollis has to say regarding this program. CLICK HERE

Please note: Prerequisites and training requirements are subject to change without notice.


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