Akula TPU 1W
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https://overunity.com/19306/free-energy-device-1-watt-akula-tpu-with-circuit-diagram/

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The Akula TPU runs on tapping the magnetic field of the earth.
In this moment this device is putting out about 1 Watt of free power.
As it depends on the location of the earth magnetic field these coils need to be adapted to the location for the maximum output. At his home in Russia he gets already more output, but as he stays in Germany during taping of this video, there was less output there, cause the magnetic fields from the earth are a bit different there. (different resonance frequencies)
This TPU did also run in an underground bunker wrapped in Aluminiumfoil !
So you have it… no hidden batteries and the coil structure is shown.

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I'm working on my TPU build at the moment and it would be helpful if you could pull some screenshots
out of this Akula video where he takes the coil apart.  There is some shielding material
in that coil and it would be important to identify (for reference) the location of these shields
since these are more likely collecting electric fields and acting as capacitor plates.

What is nice about this particular circuit is it uses feedback so it would be self tuning to the coil.
Also notice the L3, it is open ended, meaning it is really acting as an antenna and used
as the feedback sensor that sets the running frequency.
L1 is the output collector and L2 appears to be the exciter/control coil.

So yeah, I think this one can be replicated fairly easily if we can get some good screenshots
of the critical components and their relationship to the components around them. 
Problem I see though is in the video, the PCB has an IC chip on it, so we know the schema
is different than what is presented, but we may still be able to understand its operation
well enough to keep moving forward.

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I'm using full digital control that produces very clean fundamental, harmonic and subharmonic
frequencies.  I've run into one "head scratcher" that I cannot comprehend and I'm hoping
the Akula build will give me a clue.  The strangeness I'm seeing now is:  I'm monitoring
the fundamental frequency via voltage on my scope probe.  When I inject a harmonic,
the fundamental frequency changes to that frequency even though the drive is still providing
the fundamental frequency.  When I do the same thing with a subharmonic, this same anomal
 does not happen.  Very screwy.  There must be some relationship here that alludes me.
 Looking at the Akula TPU, it looks like he only uses a fundamental frequency and a subharmonic.
 The Steven Mark device has three inputs instead of two, which probably explains why it can produce
 much more output power.  So I'm guessing if I can follow the example Akula gave us here,
 I can probably jump to the next step and I suspect Akula knew that too and didn't provide
 I much higher power device to demonstrate.