The FBI would have checked them out for so-called "secret documents". If they had found anything else, it would have been used against Trump, since they wanted to destroy him. Also the tunnels would not have been illegal, since Trump owns the property. The Brooklyn tunnels went through the city's property.There are secret tunnels under Mar-A-Lago. I guess if we use the logic of these conspiracy theorists that must mean they are being used for sex trafficking of underage girls and boys
Giuliani used a tunnel under Mar-a-Lago to go back and forth from Trump's home, where he stayed while he was depressed and drinking heavily, book says
Rudy Giuliani's ex-wife in a forthcoming book says he and Trump are "protective" of each other: "We moved into Mar-a-Lago and Donald kept our secret."www.businessinsider.com
Surprise! There Are Apparently Secret Tunnels Running Under Mar-a-Lago
If the FBI needs to return to Mar-a-Lago to retrieve more classified documents, they might want to head underground.uproxx.com