The ship Mare Jonio was originally constructed as a tugboat in 1972. Operating on behalf of Mediterranea Saving Humans (MSH), Mare Jonio has been active in a Search and Rescue (SAR) role rescuing shipwrecked refugees in the Mediterranean Sea since October 2018.
The project also has the support of the German association Sea-Watch and the Spanish Proactiva Open Arms. The ship is owned by through Idra Social Shipping SRL and is managed by Augustea Imprese Marittime e di Salvataggi SpA of Genoa, Italy; Mare Jonio sails under the Italian flag.
Mare Jonio is 37m long (some sources give 38m, more specifically 37.55m in one source), with a beam of 9m and a draught of 3.2m. The ship has a maximum speed of 13knots.
Between 2007 and 2018 the ship operated largely on the western side of Italy.
Mare Jonio began SAR operations by setting sail on 3 October 2018.
Mare Jonio was seized by the Italian authorities in September 2019 over a dispute regarding the legality of landing shipwrecked refugees at Italian ports. The ship remained confiscated until February 2020, when a jury accepted Mediterranea's appeal, immediately releasing the ship from seizure.
During March 2020 MSH announced that its two ships, Mare Jonio and Alex would suspend their navigation due to the COVID-19 pandemic. Operations resumed in June 2020, and sixty people were rescued on 19 June, followed by another forty-three on 29 June.
The ship was declared to be subject to mandatory maintenance work and has been in the port of Chioggia, Italy, since November 2020.
The crew of Mare Jonio was attacked by the Libyan Coast Guard while conducting a Search and rescue operation in international waters, approximately 95 miles north of Libyan coastline.
The Mare Jonio together with the Maersk Etienne were given the "Seafarersâ Award" 2021 at Copenhagen.