Exploring all of the tunnels is impossible.
To hike the entire Citadel and visit all of the site, you will need at least 3 to 4 days and 2 pairs of walking shoes.
Taking pictures of everything would be very interesting but I will probably never succeed. ( But never say never)
However, I will show you with this website the highlights I discovered during my walks in and around the Fort.
Have fun watching.