Fisherman discovers US shipment of weapons as part of CIA plans to overthrow Costa Rican government (a US ally) due to their "building of bridges" with the Soviet Union: "Then, on 17 December, a fisherman reported sighting a mysterious ship which had unloaded “long wooden boxes” on a remote Costa Rican beach. The ship was identified as the Waltham and the Costa Rican government later received information that the vessel was registered to the “commercial section of the State Department”. This was never verified. However, the US Commerce Department at that time did own a 455-foot vessel named the Waltham Victory.
It was first reported that the boxes contained weapons.