Conclusions
This unit would make a nice homebuilder project. All one needs is a length of 6" pipe, couple of bellows from McMaster-Carr, couple of one-way valves and a lathe to cut the o-ring grooves and plenum/water trap assembly. There is a little more to it but not much. The question is: is it worth the effort? The design seems to have several weak points*:

• the counter-lung bellows are in a wrong place - too low on divers back. The WOB in anything but semi-prone position is be extremely high*.
• every inhalation must pass through several very small openings (~1") in Water-trap/Plenum assembly. This must further increase the WOB*.
• inhalation air flow takes two sharp right turns through above mentioned small openings (see illustration on the previous page), again, increasing the WOB*
• Counter-lung cover (rigid plate) traveling through CL housing (rigid cylinder) can be prone to jamming. A small rock or a shell wedged between the housing and cover would completely block the bellows movement, rendering the whole unit unbreathable, as the ADV is mechanically actuated by the CL cover pressing onto the ADV rods.
• Four screws that hold the CL cover together are drilled through, opening potential leak path into the counter-lungs.
• A small tear in the counterlung could substantly affect the ration of exhausted and injected gas, and wihout the PPO2 readout (the default configuration), the situation could quickly devolve into dangerous.

The beauty of this system is the fact, that it can be dived with a standard set of doubles configuration, and without much monitoring, since it provides "intuitive" feedback to the diver*. It is very compact, as rebreathers go, and easy to assemble and clean. As with any semi-closed design, there is no computer or voting logic to go beserk, and no batteries to go dead. The "mechanical" aspect of this unit is one of its stregths, but also a weakness, as diver's lungs are the 'engine' that has to drive the counterlung piston through the water column.

In closing, this is a very nice unit,extremely well manufactured, but close toimpossible to breathe in any other position but the "sweet spot". The fact that one has to still carry all sorts of "travel" and deco gases slightly negates the advantages of a rebreather. The unit is a great "gas extender" designed for a specific purpose.

Czech Navy will stick with CCRs for now.

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Disclaimer (as was so aptly said elsewhere):
Golem Rebreathers can NOT confirm or deny that there ever was such a unit or that they ever saw it, much less disassembled it. In the age of digital media special FX, it is easy to create anything just from 0s and 1s. Do not beleive anything you see on the Net.