Tango, I have no idea about LGW, but its not uncommon in the commercial world to have generators in the basement.
What you normally find along with these is a slightly deeper hole below them with a "sump pump" that keeps things dry.
With the weather that we have ahd recently though the pumps just cant keep up with the abnormal deluge of water that they have been dealt with.
Just look around the area that you live. Have you seen any roads flooded? Have you seen drains that have coped without issues?