This was very common in New Jersey for homes built before 1995 that had oil heat. The soil is very sandy and is easy to dig. Easy to bury oil tanks, toxic waste and bodies....
must be a Jersey thing >>
we live on top of each other..ever watch all in the family and at the end of the show you see row houses? same in NJ...in the cities.
https://www.youtube.com/watch?v=WNsONHtWKf0