2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171119We present fluid dynamics videos of the motion of a boat on a two-layer or three-layer fluid. Under certain specific conditions, this setup generates large amplitude interfacial waves, while no surface waves are visible. The boat is slowed down leading to a peristaltic effect and sometimes even stopped: this is the so-called dead water phenomenon.Fluid Dynamicstext