What are the unique safety considerations with the sub-cooled hydrogen fueling method that Daimler Truck has developed?

All systems must be designed for the applicable operating parameters such as pressure, temperature,
and flow. The sub-cooled liquid hydrogen (sLH2) approach for fueling is comparable to other processes
commonly used to handle cryogenic liquids in the industrial gas industry where remaining gas is
condensed during the fill operation. These processes often operate above the critical pressure and/or
temperature of the fluid. A sLH2 system operates at much lower pressure, under 20 bar (290 psi), than
“cryo-compressed” hydrogen (CCH) systems which commonly operate at 350 bar(5100 psi). sLH2 systems
operate more like a liquid hydrogen (LH2) system that operates at a slightly higher pressure, while a CCH
system is more comparable in operation to a high pressure gas system.