The sinking of the Rainbow Warrior
8 July 2014 Last updated at 12:00 BST
In July 1985, French secret agents sank the Greenpeace ship, Rainbow Warrior, killing one of the group's campaigners on board.
Docked in Auckland, New Zealand, the vessel was preparing to protest against French nuclear testing in the Pacific when it was bombed.
Pete Willcox, the Rainbow Warrior's captain who was on board at the time, spoke to Witness about that day.
Witness is a World Service radio programme of the stories of our times told by the people who were there.
Produced by Claire Bowes and Rachael Colson and Edited by Stephen Beard