jacob navia wrote:

There are serious hints of living beings in Mars,

If by "beings" you mean bacteria...

We know now, that Europa has an ocean below
the ice. This means that we could establish a submarine settlement in
there (if there is no life or if the life there is not incompatible
with ours). The same in Enceladus.

The water pressure might be pretty high, as some estimates put the ice
cover as being many miles thick.

Pat