There were some nuclear fracking experiments where the nukes cost in the range of a few hundred thousand dollars. It's probably cheaper than you think.
You can't cut steel in half with water. Waterjet cutting requires an abrasive media like garnet to cut through hard materials. Water is simply the power source that accelerates the garnet to Mach Jesus.
I have been going through this with claude and qwenvl3:8b this week. Both are pretty decent at inferring context and analyzing contact sheets. Finding high visual interest moments with a mixture of coarse and fine keyframes.
Hydrogen ICE is not a viable technology for many reasons. Combustion temperatures would require exotic alloys to manage and the power density is quite low. I remember BMW made a H2 ice version of one of their large V12s and it made like 125hp...