Because that newly released water is less
dense than both seawater and hydrate - seawater mix, it will rise as well.
Brine is
denser than seawater and therefore sinks to the ocean bottom and can damage the ecosystem.
At such a depth, CO2 becomes
denser than seawater and liquefies — which means that, even if a leak were to occur, it shouldn't be able to rise up to the surface.
Not exact matches
Icebergs are made of fresh water, which is less
dense than salty
seawater.
(Because water ice is less
dense than nitrogen ice, bergs of such material would waft along just as they would in Earth's
seawater, the researchers explain.)
Liquid CO2 is
denser than water, so it will head for the bottom, and since it's a non-polar molecule it won't mix with the
seawater.
(Colder and / or saltier
seawater is
denser than warmer and / or less salty
seawater.)