The Humanity 1 is a German Search and Rescue Ship. The former German research ship is owned by Sea-Watch e. V. who are using the ship for SAR operations of refugees in distress on the Mediterranean Sea. Previously, the GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) operated the ship under the name of Poseidon, after the Greek god of the sea, with the State of Schleswig-Holstein as the owner. In January 2020 the ship was auctioned and bought by Sea-Watch e. V. and renamed Sea-Watch 4 on 20 February 2020.

Sea-Watch is a German non-governmental organisation that operates in the Mediterranean Sea, notably by commissioning ships to rescue migrants.