Are working self-powered water-fuel engines being suppressed?
A closed self-powered water-to-hydrogen-to-power cycle would need to return more useful energy than it consumes splitting water and converting hydrogen back to work, which conflicts with established energy conservation and real conversion losses. Hydrogen systems using electricity or sunlight are genuine but draw energy from outside the water. Because the alleged functional self-powered engine fails that physical premise, the compound story that such working machines exist and are deliberately hidden is contradicted; this does not deny the possibility of secrecy around other technologies.