I quote from English Wikipedia:
Voice of Peace (Hebrew: קול השלום, Kol HaShalom) was an offshore radio station that served the Middle East for 20 years from the former Dutch cargo vessel MV Peace (formally MV Cito), anchored off the Israeli coast on East Mediterranean. Founded by Abie Nathan and the New York-based Peace Ship Foundation, the station broadcast almost continuously between 19 May 1973 and November 1993. The station was relaunched but solely as an online station in August 2009… The aim of the Voice of Peace was to communicate peaceful co-existence to the volatile Middle East.
… The telephone forum chaired by Abie Nathan called “Kol Ha Lev” (Voice of the Heart) and then Ma La’asot? (?מה לעשות, “What to do?”) was the only uncensored direct public dialogue between Israelis and Palestinians.
The Voice of Peace was tolerated by the Israeli Government, as Abie Nathan was a personality in the country; however, the IBA was alarmed at its popularity and set up a state-run pop service, Reshet Gimel, in May 1976. Nathan was imprisoned on several occasions for violating laws forbidding contact with enemy states and the PLO.
Nathan decided to intentionally sink the ship in international waters on November 28, 1993, after promises of a broadcast license and mooring in Jaffa port failed, and he closed the station due to heavy losses and following the signing of the Oslo peace accords, which he assumed was validation of the station’s mission.