About 30 people were injured late Saturday when a floor collapsed during a crowded dance party in South Carolina, sending dozens of revelers plunging into a basement. The accident reportedly happened at an apartment building near Clemson University. The Clemson City Police Department said that none of the injuries were considered life-threatening, but numerous people were taken to hospitals. Video of the incident shows the heart-stopping moment the floor gives way, with some students seen unsuccessfully trying to jump to safety before falling on top of the mass of people who’d already hit the ground below. In one video, onlookers are seen watching in disbelief and horror as some of the injured scream out from below.