re: The Deep View
I think it has a lot to do with the view.
In the ocean, view is restricted; the deeper we go, the less we see.
Restricted view means possible danger lurking very close by (that's why so many fairy tales take place in forests where every tree can hide a danger), making it quite unconfortable.
But in space, there is a huge unlimited, unrestricted view of the universe, of mountains far away (on the Moon).