Alan (Alon) Bodner

Selected Links
Society 6 Poster
Deeper Blue
Unexplained Mysteries

Foreign Links
Tendencias (sp)
The Hindu

Corporate Mission

The Like-A-Fish Corporate Mission is to become the leading provider of revolutionary air supply systems that are able to extract air from water, for both the leisure and the professional scuba diving industries, as well as for submarines and underwater habitats.

Corporate Background

Like-A-Fish Technologies was founded in 2001 in order to develop and provide a revolutionary tankless diving gear that is able to extract air from water. The company holds patents in Europe and in the U.S.A.

Like-A-Fish Technologies revolutionizes diving technology and marks a breakthrough in the history of diving. The company introduces for the first time in history scuba equipment that extracts air from water.

System Benefits

Longer Bottom Time

Air supply is not restricted to amount of air that can be contained in one tank, only on amount of batteries taken.

No Need for Refills

No need to refill air tanks with diving gas (save money and dependence on dive centers)

Higher Safety & Less Stop Stations

The composition of the air that is extracted from water is enriched with 34% Oxygen (similar to Nitrox), which minimizes the amount of Nitrogen that is inhaled during a dive and thus adds to the safety of a dive.

Constant Bouyancy

With conventional SCUBA gear, a diver's buoyancy changes throughout the dive, as he uses (and thus loses) approximately 4 Kg worth of air. This is not the case with the Company's gear.

Business Opportunity

Since Ancient times man has sought ways to go below the sea level. Aristotle describes the first depictions of underwater devices. The devices Aristotle described resembled a jar turned upside down, in which a diver thrust his head. During his descent to the sea floor, the diver breathed the air that remained inside the jar. In the last 60 years, the technologies for underwater breathing have progressed rapidly.

Despite the enormous developments in diving technologies, the essence of diving technologies has never changed.

Both in the times of Aristotle and nowadays the essence of underwater breathing is to enclose air in a vessel. The air enclosed in the vessel then serves as the air supply for the diver. This technique has several disadvantages. The most obvious disadvantage is the limited air supply and thus the limited bottom time of the diver.


The system can work as a replacement of common 'open diving systems'. However, because of large air and water requirements, the system is best suited for 'semi-closed systems', also known as 'rebreathers'.

Submarines and underwater habitats are private cases of rebreather uses, and where use of the new system would have enormous benefits. Many operations that are now considered to be 'impossible' become within reach when the underwater time of sub sea vehicles becomes virtually unlimited.

The arrival of the new 'Air Independent Propulsion' (AIP) systems in conventional submarines means that the only reason for the submarine to surface every few days will be to replenish the air supply for the crew. The time between resurfaces can be greatly extended when using the new system.

Besides supplying Oxygen for breathing, other uses can be found for utilizing presence of air and Oxygen under the sea.

General components of the system
(Final product will have the separator, batteries and spare air cylinder in single enclosure)

Simple Facts of Life

Fish require dissolved oxygen (DO) for breathing. In aquariums this is supplied by a bubbler.

In seas this occurs naturally, principally by wave action.

Image from popular screen saver, showing bubbles in aquarium

All bodies of water naturally contain dissolved air. In gas phase, its volume is between 1.5% to 2.5% of the water. About 35% of this air is dissolved oxygen (DO).


The dissolved air can be separated from the water by applying low pressure. This, according to Henry's Law, which states that the amount of a gas that can be dissolved in a liquid is proportional to the pressure on the liquid. Reducing the pressure will cause dissolved gas to be released from the liquid (this is what happens when you open a bottle of soda). Reduction of the pressure will be achieved by using a centrifuge, causing lower pressure in the center. After separation the air is transferred to an air bag for use by the diver.

Fizz forming in soda bottle when cap is opened

Ecological Impact

Several people inquired about the impact of reducing the dissolved oxygen (DO) levels in the waters, and raised a concern about available oxygen left for the fish to breathe. We have studied this issue and found that humans consume about twice the amount of oxygen as fish of the same weight. For example, a small school of Tuna fish weighing a total of 1,000 kgs consumes the same amount of oxygen as a group of humans weighing 500 kgs. Unless used in a small confined area, waters of low oxygen levels are readily replenished with oxygen from surrounding waters. Hence there is virtually no negative ecological impact

Early Laboratory Model

Initial Developments

  • A laboratory model was developed and successfully tested.
  • Calculations were performed for air, water and energy requirements for open and closed systems.
  • Patents written.


Latest Developments

March 2007: Development of Prototype for BioSub Project

A new prototype, made of stainless steel, was designed and produced for the purpose of participating in the Biosub project. A series of tests were performed in a private pool. Both the quantity of separated air was measured, as well as the percentage of dissolved oxygen (DO) remaining in the water after separation.

Because of instrumentation problems, the device could not be made ready in time for the BioSub experiment. However, even in these initial tests, the device was shown to be capable of extracting both entrained air as well as dissolved air. A new series of tests is planned for the near future

Image of Prototype

Whiff of DO

June 2008: Revised protptype

More tests were performed with a newly revised prototype. The tests were a huge success, and were documented by a major science television channel.

After proving feasibility, our next goal is to shrink down and optimize the system.

Extracted air entering container

Breathing extracted air

June 2010: Further Developments

The prototype has now reached a stage where all immediate goals have either been achieved or the solution is known. The following list sums up the accomplishments of the device:

1. Providing breathable oxygen extracted from water.

2. Ridding carbon dioxide naturally by mixing spent air with water.

3. Ridding excess air discreetly from chamber by dissolving it in water.

4. Low energy consumption - about 150W per person.

5. Noise emitted very low.

The Like-A-Fish system provides a complete solution for breathable air under the sea!

2012: Current Status

During the past year we have been quietly desiging a prototype to be installed on board a naval submarine.
Further information cannot be detailed at this time.

June 2015: New Development

We have joined forces with INOVA to provide the air supply system for the ATLANTIS hydrofoil / submarine, which is currently under development.

Atlantis model in display at Expo 2015 Milano

Block Diagram of System


Clip from The Discovery Channel - Daily Planet

More information                                                                       



counter free hit unique web