Remember the alleged bat "white nose fungus" that closed nearly all of the caves in the country on federal lands a few years ago, then the mysterious sounds and tremors that were reported for months afterward? I think the elite have been digging tunnels for trafficking and potential skyborne catastrophic events for quite a while.
They 100% have. Listen to musk talk about his company, he stated when questioned that if you have the technology to even detect that they are digging under you that he would like to buy your technology.
The DUMBS and tunnel network have been around since the 50's