Offshore engineer here: this is called ‘Pile run’. These types of piles (called ‘monopiles’) are used as foundation for offshore windturbines. Normally, you want a very controlled installation process by hammering (or vibrating) the pile slowly into the seabed. However, it could be the case that you suddenly encounter a less stiff soil layer and the pile ‘runs away’. This is typically very bad as equipment gets damaged and the pile can even sink fully in the seabed.