Self-made submarines are vessels that can be built by individuals or small teams using readily available materials and a range of techniques. There are various terms that can be used to refer to self-made submarines such as DIY submarines, home-built submarines, homemade submarines, and amateur submarines. These terms highlight the idea that these vessels are created by individuals who have a passion for exploring the underwater world in their own unique way. While they may not have the advanced features and capabilities of professional submarines, these homemade creations can offer a fascinating glimpse into the ingenuity and resourcefulness of their builders.