 The bubble is buoyant, and so it rises towards the surface.If the bubble reaches the surface as it collapses, it can create a pillar of water that can go over a hundred meters into the air (a "columnar plume").If conditions are right and the bubble collapses onto the ship's hull, the damage to the ship can be extremely serious; the collapsing bubble forms a high-energy jet that can break a metre-wide hole straight through the ship, flooding one or more compartments, and is capable of breaking smaller ships apart.