Yes, so to create that pressure, you can use various methods. All of which has an energy cost.
ie. E=MC^2
Theoretically you could create that pressure by building a fusion reactor on the Ocean floor, where the pressure is already high. So at least you have a higher starting point, with no additional energy cost.
Ignoring the practicalities of doing that, the energy cost saving would be huge. However, is that pressure even close enough to the necessary magnitude?
What about building something under the Earthās crust? Thereās even more heat down there. That heat energy could contribute to the start-up energy costsā¦
ā¦but if you could dig that deep, why not just tap directly into the Earth and harness energy that way.
and another thing!
The idea of a fusion reactor is trash.
You have to feed it a theoretically large amount of hydrogen, that will be permanently transformed into Helium.
Then what? Use an amount of energy to synthesise more hydrogen?
We already need to do that for hydrocell technology. Using electrolysis to split water into Oxygen and Hydrogen. Then use the cell to recombine them back into water and draw electricity from the process.
But at least that economy can be repeated infinitely without āannihilatingā a natural resource.
What are you supposed to do with all that helium?
Fuse it into Carbon? Thatās the one thing we donāt want more of 
This is ādead starā technology!
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Hypothetically If there was a way to reclaim the fused helium then using it for lifting body airships would possibly be a good use. Also helium is a valuable resource for rocket pressurization and so as we deplete natural reserves itāll make rocketry more difficult. Not to mention just all the cool stuff we can do with super chilled helium for science. So Iām a fan of having ample reserves of helium in exchange for the minor depletion of resource that results in electrolysized water.
To a point.
Of course Iām still not sold on the wide practicality of Fusion without major breakthrough in efficiency, so keep on researching and find answers but in the meantime lets actually make some power.
What Iām hearing is that fusion power will let us also fill the skies with rigid airships. That alone is sufficient reason to go all-in on fusion.
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Cheaper energy storage for renewable energy.
