Fathoms are a unit of measurement used primarily to measure the depth of water. One fathom is equal to six feet or approximately 1.83 meters. This measurement is commonly used in maritime contexts, such as navigation and fishing, to help sailors and fishermen understand how deep the water is. The term "fathom" can also refer to the act of understanding something deeply. In this context, it is often used in phrases like "to fathom the depths of someone's thoughts." This figurative use highlights the idea of exploring complex ideas or emotions, similar to how one might explore the depths of the ocean.