Among those detained is Sinn Féin Senator Chris Andrews, who was aboard one of the vessels. Included among the passengers were Greta Thunberg and Nelson Mandela’s grandson, Mandla Mandela. Some of the boats intercepted included the Spectre (Senator Andrews’ vessel), the Alma, Sirius, and Adara. Senator Andrews, who has participated in multiple previous flotillas, warned before departure that Israeli forces would likely use water cannons and board at night. How This Compares to the Earlier Flotilla (with Greta Thunberg)This recent Global Sumud Flotilla is not the first time foreign activists — among them Greta Thunberg — have attempted to breach Israel’s blockade of Gaza.