Human settlements under the sea
How can you live under the sea and stay alive as a permanent home?
Just some brief comments about your question.
Obviously, in order to provide an existence similar to that we
'land-lubbers' experience, you would have to create a menu of
items essential to such a life. Naturally a reliable food and water
resource is necessary. Needed too is a means of removing waste
products ( and 'used' air) and the provision of
clean air. Any person living apart from regular society would
naturally need some sort of thing to keep them busy. This
could include everything from TV (so you would need electricity)
books, games etc. Needed to would be safety features to insure
lives could be saved in the event of an accident. This list could
go on and on and on depending upon how much you would want your
sub-marine life to mimic life on land.
One consideration for anyone pondering such a life is how the
higher pressure one's body would experience under water (this would
vary with depth) would affect one's health and longevity. For
instance, the higher pressure might add stresses to one's heart
and kidneys and result in lower life expectancy. There could
be other health consequences as well, for example possible
depression from loneliness and being apart from family and friends.
I hope this offers some ideas regarding your question.
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Update: June 2012