It is a proof of concept thing. This article has more info on how it works, and talks about 2 plants being built, 1 in Canada and 1 in Scotland, that will each remove amillion metric tons of carbon dioxide a year from the atmosphere:
One of the nightmare climate change scenarios is that huge reserves of C02 trapped in the oceans will suddenly be released. Adding more down there is a very fragile solution even if practical.
It is a proof of concept thing. This article has more info on how it works, and talks about 2 plants being built, 1 in Canada and 1 in Scotland, that will each remove amillion metric tons of carbon dioxide a year from the atmosphere:
https://thebulletin.org/2021/08/carbon-capture-dream-or-nightmare-could-be-coming-or-not/