Please excuse the ads, Indiana Caverns is sharing this via another You Tube feed. This is an underground cave flight in the Indiana Caverns cave in Southern Indiana. Set your viewing resolution to HD.
DJI Phantom 2 Drone First Underground Cave Flight
Tours leave frequently throughout the day. You must arrive no later than 4pm EDT on weekdays and 4:30 on Saturday and Sunday to be guaranteed a spot on the last tour of the day. The cave temperature is 56 degrees all year. Weather is never a problem.
Closed only on Thanksgiving and Christmas Day.