# Breathing Underwater... Forever Poseidon Mk IV Discovery Rebreather By Alex Covert | Published 2008-03-08 | Lifestyle Source: Trend Hunter, https://www.trendhunter.com/trends/breath-underwater-forever-poseidon-mk-iv-discovery References: [dvice](http://dvice.com/archives/2008/03/mk_iv_discovery.php) & [poseidon.se](http://www.poseidon.se/) You can't quite breath underwater forever, but, longer than you normally could. The Poseidon Mk IV Discovery is what those in the [diving world](https://www.trendhunter.com/trends/dive-computer1) call a rebreather - it recycles a user's oxygen. Using p02 scrubbing and oxygen cells, it turns unused oxygen in your exhales into [breathable air](https://www.trendhunter.com/trends/alveos-one). Supposedly, the average person only uses about 25% of the available oxygen in the air. The exhale contains the other 75% of oxygen along with carbon dioxide and nitrogen. It's smaller, weighs less, and even costs less than [traditional diving tank systems](https://www.trendhunter.com/trends/diverplus). ## Trend Insights (Trend Hunter) - Score: 4.0/10 - Popularity: 44% | Activity: 68% | Freshness: 8% - Audience gender: 70% men, 30% women - Primary generations: Millennial - Top markets: North America, Europe ## Categories [Trend Hunter](https://www.trendhunter.com/trends) > [Lifestyle](https://www.trendhunter.com/lifestyle) > [Sports](https://www.trendhunter.com/sports) ## Key Themes ### Key Themes Behind This Trend - **Rebreathing Technology:** New rebreathing technology is disrupting the diving industry by offering longer underwater exploration opportunities. - **Oxygen Recycling:** Oxygen recycling technologies like the Poseidon Mk IV Discovery may revolutionize industries that require breathing equipment by reducing costs and increasing efficiency. - **Conscious Breathing:** The growing trend towards conscious breathing practices and mindfulness is leading to increased interest in breath-recycling technologies like the Poseidon Mk IV Discovery. ### Where This Applies - **Diving:** The Poseidon Mk IV Discovery rebreather technology is disrupting the diving industry by offering longer, cheaper, and more efficient underwater exploration. - **Emergency Services:** Oxygen recycling technologies like the Poseidon Mk IV Discovery are revolutionizing emergency services by extending the lifespan of oxygen tanks and allowing first responders to stay in dangerous areas for longer periods. - **Aviation:** New oxygen-recycling technologies like the Poseidon Mk IV Discovery may revolutionize the aviation industry by reducing the weight and size of oxygen tanks and increasing the efficiency of oxygen use during flights. ## Related on Trend Hunter - [Submarine-Inspired Diving Masks](https://www.trendhunter.com/trends/periscope-mask.md) - [Backpack-Style Scuba Tanks](https://www.trendhunter.com/trends/smaco-s700max.md) - [Air-Integrated Dive Computers](https://www.trendhunter.com/trends/airintegrated-dive-computer.md) - [View-Expanding Scuba Masks](https://www.trendhunter.com/trends/scuba-masks.md) - [Waist-Worn Underwater Thrusters](https://www.trendhunter.com/trends/underwater-thruster.md) - [Bespoke Scuba Diving Drysuits](https://www.trendhunter.com/trends/diving-drysuit.md) - [Underwater Jetpack Designs](https://www.trendhunter.com/trends/kikfin.md) - [Scuba-Centric Reading Glasses](https://www.trendhunter.com/trends/underwater-eyewear.md) - [Intuitive Underwater Scuba Scooters](https://www.trendhunter.com/trends/surando-underwater-scooter.md)