The FBI is investigating an underground tunnel leading to a Florida bank—but they have no idea who dug it, or when. Public-works employees in Pembroke Pines got a call Tuesday night about what was first believed to be sinkhole in a road near a Chase Bank branch. But local police called in the FBI after an entry point was found in a nearby wooded area. “This is truly a unique case here,” FBI Special Agent Michael Leverock said Wednesday. “I would like to say that I saw something like this in movies, however, this hole is so small that—it’s unique.” Leverock said the “claustrophobic” tunnel is only a few feet in diameter, and added that whoever dug the hole didn’t manage to get into the bank. A power cord, a winch, and a small generator were discovered near the entry point. It seems pick axes were used to dig the hole and wagons were used clear the dirt. “I don’t know how they did it. I would like to put it into words for you. But it is so cramped in there, and that wagon is—I mean it’s a puzzle. I can’t imagine how they did it.”