# How far down do property lines go?

**URL:** <https://boards.straightdope.com/t/how-far-down-do-property-lines-go/715553>\
**Category:** Cecil's Columns/Staff Reports\
**Created:** [March 21, 2015, 12:53am UTC](https://boards.straightdope.com/t/how-far-down-do-property-lines-go/715553 "2015-03-21T00:53:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BCDeb](https://avatars.discourse-cdn.com/v4/letter/b/ecd19e/32.png) [@BCDeb](https://boards.straightdope.com/u/BCDeb)\
**Post date:** [March 21, 2015, 12:53am UTC](https://boards.straightdope.com/t/how-far-down-do-property-lines-go/715553/1 "2015-03-21T00:53:10Z")

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Cecil wrote at the end of his article:

“Oh, and also: at ten miles down the temperature will be about 750 degrees, so make sure that bar car has plenty of ice.”

With Cecil there are always these great punch lines! I love it, lol !

(I wanted to keep this separate from the other more serious thread started by Senegoid.)

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**Author:** ![Senegoid](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/senegoid/32/6606_2.png) [@Senegoid](https://boards.straightdope.com/u/Senegoid)\
**Post date:** [March 21, 2015, 6:00am UTC](https://boards.straightdope.com/t/how-far-down-do-property-lines-go/715553/2 "2015-03-21T06:00:06Z")

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It’s a real engineering design issue to be taken into consideration when building a [gravity train](http://en.wikipedia.org/wiki/Gravity_train) to get you from, say, Paris to Moscow or Los Angeles to Sydney.

And you’d still need to get all the governments “on board” whose territories you’d be burrowing under.