Is this proof this person did this to try destroy our base on pve?

As per title really, came on and saw someone had dug under our base (luckily it didnt collapse!) but still! if we was on pvp fine but we wasnt, being on our faction planet and only a few people showing on the intruder log…admin? correct me if im wrong but pretty sure thats a rule break right there…

here take a look,

and my intruder log…

Could have only been two people if im correct?