Special vessels are those designed with a particular, highly-specialized task in mind. NauticExpo offers vessels specialized for ice breaking, cable laying, boring, various types of dredging, lightering, etc.
Each such vessel is designed for a specific activity. Icebreakers are designed to sail in ice-clogged waters, cable layers deploy and repair submarine cables, training ships are used to train officers and seamen, patrol boats carry out surveillance, dredgers modify the seabed and lighters effect a multitude of transport tasks.
Special vessels vary in design and technology, depending on intended function.
Choice will depend on the intended use of the vessel.