La. Civ. Code art. 490
Current with operative changes from the 2024 Third Special Legislative Session
Unless otherwise provided by law, the ownership of a tract of land carries with it the ownership of everything that is directly above or under it.
The owner may make works on, above, or below the land as he pleases, and draw all the advantages that accrue from them, unless he is restrained by law or by rights of others.
La. C.C. § 490