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most likely bad o-rings or injector
Most likely, the turbocharger is toast. I hope you have some butter handy to help you eat it.
Either it will not run at all, or run very poorly. Either is likely to do severe damage to the engine.
Most likely they are engine mounts. As for the loud engine, check the exhaust.
Diesel
It does not have any sort of fuel type sensor, putting gasoline into the fuel tank of a diesel Mercedes will likely destroy the engine.
When hydrogen is burned, water vapor is formed. During running this will be blown out of the exhaust, but when the engine is stopped some will no doubt condense, so could corrode steel in the engine. But it is less likely than for a gasoline engine where other combustion products like nitrogen oxides are also formed, and these are more corrosive. I have no direct experience but hydrogen engines are said to be much cleaner than gas or diesel ones
Black
Depends. An older Diesel is likely to keep running. A modern, with a full set of electronic engine diagnostic might not.
check the catalytic converter. if the engine isisnt running hotter than normal it is most likely plugged exhaust somewhere likely in the catalytic converter
Most likely the problem is with the Pressure Sensor in the engine block.
They run on the water. They most likely use diesel fuel to power the engine.