Thirty-six year-old Koo Bon-hee recalled hearing a loud bang, when suddenly the ferry he was on tilted drastically in the water.
The Sewol ferry, traveling from Incheon to Jeju Island in South Korea, was starting to sink, and it was sinking fast.
Those still standing after the impact began to scramble for the exits, when they heard an announcement over the speakers telling everyone to stay in their places and sit still.
Some, like Koo, followed their instincts and ignored the announcement, leaping into the icy cold water where they were able to be rescued.
Others heeded the announcement and remained sitting inside the cabin, waiting for further instructions.