Understanding how certain types of sand deposits are formed in river and estuary channels is important for creating accurate models in the oil industry. Researchers have found that slow, retrogressive failure of steep underwater slopes, known as breaching, is a key process in creating these sand deposits. By studying sedimentary structures in different environments, they have identified the characteristics of these deposits and how they can impact hydrocarbon flow. This information is crucial for accurately estimating the volume of oil in a reservoir and planning how to extract it effectively.