Scuba tank, the filling process takes several minutes I heard, think 15+ for a car. The tanks in cars are around 800 bar, reinforce carbon fibre with a bladder inside. To fill it the compressor station has to deliver higher pressure, I recall 1200 bar but not sure about it. Also hydrogen has the oddity to produce heat when expanding, which means the filling process needs to be actively cooled.

Considering current CCS and future MCS charging ports and their speed I think the hydrogen lost another advantage if it ever had a refuelling time advantage.