A melting glacier collapsed in front of a group of onlooking tourists who were standing on a nearby boat in Tracy Arm Fjord, Alaska. According to a video posted on YouTube Friday, at least one tourist suffered from a broken leg.

The 200-foot glacier broke apart and plummeted into the sea, sending ice shrapnel and debris everywhere. People can be heard yelling "danger, danger!" and "holy crap" as ice flew into the water, but passengers ran for safety when large chunks of ice flew onto the deck of the boat, striking one woman and breaking her leg, according to the video's description.

Other passengers can be seen calling for help and snapping pictures of the imploding glacier. The ice also struck the boat's engine, causing billowing black smoke to erupt.

Watch one of the many videos of the collapse here: