Resonance method of ice destruction
The Resonance method of ice destruction means breaking sheet-ice which has formed over a body of water by causing the ice and water to oscillate up and down until the ice suffers sufficient mechanical fatigue to cause a fracture. == Resonance == If static force is applied to a sheet of ice it will flex slightly before suffering a catastrophic failure.
Source: Wikipedia — Resonance method of ice destruction (CC BY-SA 4.0)