'underground passage' [Duplicate]

[viktor]

well not necessarily needing that name but i couldn't think of something broader. basically you would go in a building room extension w/e and you start it then you need to go to any other room building extension etc.. in the same town and make the other end to have the project ready for work.
you would need a shovel and pickaxe and either a hammer or trowel depending if it is wood or stone
once built, you can enter it from either end like entering a room and then exit either end using the 'location' menu. also this would allow for 2 locks one on each end.
a wooden passage should basically take the same wood and have a similar capacity as a cottage, same with a stone passage and building/room.
as for wether you should be allowed to build one outside? don't care, would technically allow people to have back doors but even if you have to build inside a building you would still technically be able to have a back door just put the other end in a different building.

[Chris Johnson]

Moved to Rejected suggestions as this is a duplicate, suggested several times before.