The hydrogen peroxide engine that Niri Te built, from what I can tell, is a type of Walter turbine. I've searched everywhere for info and the original German patent (which as far as I can tell was lost after WWII) and have returned with nothing. All I have found out for certain is that the design never (pardon the pun) took off as a method of propulsion because of the volatility and storage issues associated with HTP (for example, the "HMS Exploder" and U-1407). Most of the info drops off around 1950, and what info I can find is about engines that also require C-Stoff or medium-weight crude fractions such as kerosene or diesel.
It's pure speculation, but at the time the military may have had AIP systems (fuel that contains its own oxygen, how convenient...) or rocket engines (basically the same design without a turbine fitted with a de Laval nozzle) using the same tech that were classified, and through convergent evolution Niri Te's team unwittingly built classified technology.
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