you know if you taped a fish's gills shut it would "drown".....
this is because the the gills actually "filter" the oxygen from the water causing it to breath.....the fact that a fish dies with out breathing water is because they don't have lungs they actually need their gills to take in the water they can't just take in oxygen by itself.
hyrdo pulls the water from namor and with that by now you probably know i was going absolutely no where with the science lesson lol