The Inchindown tanks are a disused underground oil depot located in Invergordon, Ross-shire, Scotland. They were built between 1938 and 1941 to serve as a bomb-proof fuel oil supply for the Royal Navy’s base at Invergordon during World War II. The complex consists of six massive tanks, five of which are 237 meters long and 13.5 meters high.
Interestingly, the Inchindown tanks are known for holding the record for the longest reverberation in any man-made structure. This means that sounds produced inside the tanks echo for an incredibly long time. In fact, the reverberation time surpassed that of the Hamilton Mausoleum in 2014, setting a new world record.
The tanks are currently designated as a Category A listed building, recognizing their historical and architectural significance. Listen for yourself!