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Please note the Rule: "It is forbidden to penetrate into neighboring territories." That is, based on a literal interpretation, if it were possible not to break through the guard at the Entrance to the Teleport (Underground) from one's own spawn point, it would not be considered a violation (not breaking through the guard at the Entrance to the Teleport (Entrance to the Underground), since the guard at the Entrance to the Teleport (Underground) is located on the spawn point from which the Player leaves, but not breaking through the guard on the other side of the Teleport (Underground) - I consider unacceptable, because not breaking through the Exit from the Teleport (Underground) is identical to the concept of "penetrating into another spawn point" without breaking through the guard of that spawn point, i.e., it entails a violation of the Rules.
However, Valentin, I am not saying that you are wrong, because it would indeed be fair to equalize the sides, where there is no Teleport=Underground and where there is, I am only interpreting the Current Rules regarding Teleports=Undergrounds as I have written.
And I will be "all for" adding this "nuance" (the possibility for a Player who has a Teleport=Underground to break through only one guard, i.e., the guard either at the entrance or at the exit of the Teleport=Underground) to the current rules, in order to eliminate the possibility of ambiguous interpretation of the Rules.