Consequences of sudden exposure to very low temperatures

[nyckelpigor]

And by "very low temperatures" i mean something akin to being lowered feet-first into a vat of liquid hydrogen over the course of several minutes.What would be the consequences? How would the victim feel? How far in would he make it before he dies? How would the body end up looking like?

All my search terms resulted in lots of information on hypothermia, but I imagine that my situation should have very different conseuqences from obvious reasons.