With a fully equipped underground shelter designed to keep the leader safe for several months, in case of an attack involving use of unconventional weapons, the palace is more than just a luxurious castle.
The bunker in the palace has a fully serviced air filter system and is also equipped with emergency generators, fire alarm, water pumps, and a ladder fixed in what could have served as a back emergency exit to help the leader escape. (etc.)
This has a video of the palace and swimming pool – worth seeing. (my note)