28 June 1991,
The Spanish army pierced two Greenpeace zodiacs in Santurtzi. Greenpeace went to block the boat with Baltica slopes in the port of Santurtzi. Barakaldo's court issued an order to unblock Baltica. Five members of the environmental organization were arrested.
Source:
The army boats arrested five Greenpeace participants yesterday. (Euskaldunon Egunkaria, 29 June 1991).