Don't know if this is old news or not but there's some great pics on Uboat.net. Have included a comment I found on the Osprey site when did a quick google for these bunkers. uboat.net - The Galleries In some cases, such as the Fink II bunker in Hamburg, the entrances were simply dynamited to prevent members of the public gaining access and the bunkers abandoned, still with U-Boats inside. Can't see any U-boats in there but a wonderful thought!