One thing I noticed while playing Ambitions, and I have to assume that it's a bug, is that any gems collected when using your Personal Drilling Device do not count towards your Gems Collected count. Also, when creating tunnels with the Drilling Device I made a tunnel to a Junkyard, named it and accidentally set off a detonator too close to the hole, causing it to become a salvage item. You can salvage it, causing it to disappear and it then goes into your family inventory but can neither be sold or placed on the ground. The location/name still shows up in the menu of tunnel travel locations, but I have yet to try it and see what happens.