The NCC not only monitors the thickness and composition of the ice, but also makes sure that there is not too much weight on the ice surface, especially in any one spot.
The weight of crowds, snow and snow removal equipment must be dispersed for the ice to remain safe. The ice inspection team monitors the vertical movement of the ice. If the ice sinks, it means there is too much weight on its surface. Ice has an amazing capacity to depress gradually when weight is applied, and then to gently rebound to its normal position as the weight is removed or dispersed.