875 atmospheres equals 12,858 PSI (pounds per square inch) pressure. Such a tank in an automobile in not conceivable.
I'm not a hydrogen fan at all, but 12,000 psi storage tanks are conceivable. Current-technology FCV H2 storage tanks work at between 350-700 atmospheres (5,000-10,000 psi). Even everyday CNG tanks, now used in all kinds of CNG vehicles, including school busses, store their gas at about 3,000-4,000 psi.
Of course, why anyone would conceive of using an inefficient, NG-based energy technology like hydrogen that requires such technological storage miracles, along with extremely expensive fuel-cell miracles, is beyond me. Li ion battery-based electric EV's and PHEV's are already proving themselves on the road how simple they can be to drive/own on an everyday basis, can be recharged nightly at home with no infrastructure changes and at a fraction of the per-mile cost of H2, and are increasingly demonstrating they have a order of magnitude simpler requirement for (relatively) fast DC charging refueling stations for long-distance travel than H2 fueling stations (Tesla Superchargers as an example).