The Castle Tunnel is a two-lane tunnel that connects Union Drive East with Union Drive West via a tunnel under Castle Gardens at the southern tip of Algonquin in Grand Theft Auto IV. It passes under the pedestrianised area of Castle Gardens and was presumably built to bypass the busy financial district, The Exchange.


Location Type Road Direction
The Exchange Road begin

Union Drive West n/b direction: Exit toward Union Drive West
s/b direction: Entrance from Union Drive West
Castle Gardens Road end

Union Drive East n/b direction: Entrance from Union Drive East
s/b direction: Exit from Union Drive East