Offshore Vessels:

Offshore vessels mainly help in oil exploration and construction jobs at sea. Offshore vessels are of several types.
Some of the main ones are:
Supply Ship: Vessels that supply to offshore rigs
Pipe Layers: Vessels engages in laying pipes and cables
Crane Barges or floating cranes: A crane vessel, crane ship or floating crane is a ship with a crane specialized in lifting heavy loads
Semi-submersible Drill Rigs: These are Mobile Offshore Drilling Units to make stable platforms for drilling oil and gas
Drill Ships: A drillship is a merchant vessel designed for use in exploratory offshore drilling of new oil and gas wells or scientific drilling purposes
Accommodation Barges: Could be a stand-alone floating hotel or can include accommodation as well as space for Cargo
Production Platforms: To extract and process oil and natural gas or to temporarily store product until it can be brought to shore for refining and marketing
Floating Storage Unit (FSU) – Floating vessel mainly used for storage of oil and by-products.
Floating Production and Storage Unit (FPSO): A floating production storage and offloading unit is a floating vessel used by the offshore oil and gas industry for the production and processing of hydrocarbons and the storage of oil
Anchor handling vessels – These are used for offshore construction and installation operations.
Diving vessels – Are vessels used by divers for diving in the ocean for underwater jobs