Drone footage captured a 10ft-long hammerhead shark stalking a clueless swimmer floating on his back.
The video showed the man completely unaware of the shark while he relaxed in the water off a beach inMiami, Florida.
It was all captured by a drone photographer who just so happened to be flying his drone over the water at the time.
The photographer was shocked when he saw the man floating on his back and had no way to warn him.
The guy swimming was so oblivious he was even gave the drone a thumbs-up as it flew over him.
The shark eventually swam off and the man was unharmed and probably had no idea what happened until he saw the video going viral.