The RV Celtic Explorer is the larger of the two state-owned research vessels run by the Marine Institute. It is a multi-purpose research vessel which came into service in 2003 and is designed for fisheries acoustic research, oceanographic, hydrographic and geological investigations as well as buoy/deep water mooring and ROV. Operations. At 65.5m in length, the vessel can accommodate 35 personnel, including 20-22 scientists. The vessel is based in Galway, Ireland, which is ideally located as the gateway to the Atlantic and enables the Celtic Explorer to facilitate both national and international research and exploration with ease.