If I murdered 4 people (for arguments sake, let's say it's my neighbors who appear to be perfect and have lots of friends), how deep a grave should I be digging? I only want ... moreIf I murdered 4 people (for arguments sake, let's say it's my neighbors who appear to be perfect and have lots of friends), how deep a grave should I be digging? I only want to dig one large grave so, for 4 bodies to fit comfortably and, allowing for frost heaves (cold weather issue), how deep should I go to ensure no one ever discovers it?