Doomsday Castle (2013)

S1E1 Before the Flood

A former army lieutenant calls on his children to assist in completing his Doomsday Castle, a self-sufficient stronghold designed for the apocalypse. Key projects include constructing a drawbridge for the entrance, clearing out the bunker where they'll reside, and reinforcing any vulnerabilities within. The siblings must collaborate to realize their father's ambitious dream while readying themselves for impending chaos.