Hi just to mention i visted the Meseritz fortified line (now in Poland) last week snd had aguided tour of a section of PzWerke 717 Scharnhorst group. it is an amazing place. i have a pictures if anyone is interested. the damage seen wass actually caused by the russians after they captured it, to see how strong it was, the plan to complete the section visted (near the village of Kalawa) with heavy artillery was never completed but inside the finished bunker you can see the blanked off walls of tunnels never completed. The polish guide stated it was manned by an ear battalion.
As for the battle when the 1st guards tank army broke through the line on the 29/01/45 some German units managed to get underground before the Main soviet army followed up and the battle lasted 2 days.

Please email for more info or photos, and if you get the chance it is well worth a visit

Matt