On the subject of buried stuff, local rumour has it that Porthcawl habour in South Wales, UK, used to be very much bigger. The story goes at the end of WWII, loads of US Military jeeps, trucks and other vehicles were dumped in there and it was covered over.
You can still see now where the current area of the habour extended way back inland.
Wether true or not, I am unsure, but I am deffinately curious! :-)