Weighing in at just 11 kg / 23 lbs without cylinders, your SE7EN is an easy travel companion that will open up a world of dives beyond your imagination. Stylish, rugged good looks will let fellow divers know that an adventurer is among them.

Versatility is everything. Whether you’re on a gentle dive on a tropical reef or a challenging, deep wreck dive, Versatile Performance Technology© makes your Poseidon SE7EN the perfect companion, equally at home in all environments. Other rebreathers are described as “recreational” or “technical”, putting artificial limits on your diving experiences. Capable of whatever dive you want to do, the Poseidon SE7EN is the only rebreather you’ll ever need.

Poseidon has been at the forefront of diving technology for almost 60 years and we know that ultimately, dive safety is everything. Patented safety technology on board the Poseidon SE7EN looks after you and lets you and your buddy know through a three-level alarm system if something isn’t going according to plan.

The popularity of the Poseidon SE7EN and its predecessor, the MKVI means that it is available and supported almost anywhere you want to go diving. Poseidon gives you more training, rental, support and destination options than ever before.

How Poseidon SE7EN Technology Works

All closed circuit rebreathers use oxygen, diluent (air/trimix), a breathing loop, counter-lungs, a mouthpiece to deliver the breathing gas, a scrubber to remove the carbon dioxide from the system and a method to replace the metabolized oxygen. That’s the easy part and where other rebreathers stop but Poseidon SE7EN technology really starts!

What makes the Poseidon SE7EN unique is the way in which it manages the gas in the breathing loop. Automatically calibrated oxygen sensors detect the PPO2 in the breathing loop and solenoids automatically inject oxygen as required to maintain the appropriate PPO2 for the diver’s current depth. The SE7EN diver does not need to adjust PPO2 set points or manually maintain a set point; the SE7EN does it all for them.

Throughout the dive, Poseidon safety technology is monitoring the oxygen sensors to ensure that they are working perfectly. Gas levels within the loop and the cylinders are monitored to ensure that the SE7EN diver has sufficient diluent gas available to reach the surface in the unlikely event of needing to “bail out” to open circuit. A three-level alarm system is there to alert the diver and buddy if something does not go according to plan. Alarms are delivered visually, by the wrist computer and the VPT© Battery, audibly via the VPT© Battery and physically, via the mouthpiece that incorporates Juergensen Marine DIVA vibrating alert technology.