The cause of the problem was not 'immediately' clear. [=is was not known right away]
They live in the house 'immediately' [='directly'] behind this one.
We need to leave 'immediately'. [='at once', 'right away']
(..) has announced in an emergency press conference that China is standing down. China is stating that all intelligence, they have received, will be shared immediately with all the other landing sites. Scientists from around the world are sifting through information received... (..)2016 Arrival