👉 The term "keelhales" is a term used in maritime engineering to describe the phenomenon where the hull of an ocean-going vessel becomes a series of large, open gaps or depressions on its keel. These keelhales can be caused by corrosion, fatigue cracking, or other factors that cause the hull to weaken and potentially collapse during rough weather conditions. Keelhales are often observed in vessels operating at high speeds or with strong currents, as they can disrupt the normal flow