The facility was 90% completed when, during March 1945, it was heavily damaged by Allied bombing with Grand Slam "earthquake" bombs and abandoned.
Fasilitas itu 90% selesai ketika, pada bulan Maret 1945, mengalami kerusakan parah akibat pengeboman Sekutu yang menggunakan bom "gempa bumi" Grand Slam dan ditinggalkan.