Palestinian supporters call it a "Freedom Flotilla". The Israeli Government named it the "Terror Flotilla."
Last month five vessels planned to set sail for Gaza, their mission to try and break the Israeli-imposed naval blockade of Gaza.
On board the ship were human rights activists, artists and political figures representing 17 countries, along-side media from around the globe.
One of the journalists on board was our Native Affairs reporter Ruwani Perera, who, along with cameraman Jacob Bryant, were there to observe the voyage.
Here's their account of what happened on board.