Viewers stand on two wooden floats, which were installed in a narrow corridor. When the warning lamp lights up, floats are suddenly pulled up from water by a winch.
When standing, viewers do not realize the size and weight of the floats they are standing on. When watching from outside, however, viewers can see that the floats are quite heavy and large in size as they hang in the air.
The entire movement sequence is controlled by a program and is automatically repeated at interval.