system
Given the following post, respond as if you're commenting on Reddit:
human
[Bioshock] Why isn't there a "breathe underwater" plasmid?

You'd think that would be pretty useful in an undersea city...
gpt
Even if they could deal with the issue of water pressure and cold (Rapture is in the north Atlantic), it would provide a very easy way to escape the city. Neither Ryan nor Fontaine wanted people to leave Rapture. That is also partly why the Teleport plasmid was never stabilized.