- NOVEMBER 1996: Russian Mars ’96 space vehicle disintegrates over Chile and Bolivia, likely spreading its payload of nearly half a pound of plutonium. Searchers found no
remains of the spacecraft which was believed to have burned up. Eyewitnesses saw the flaming reentry over the mountains in the region.
- FEBRUARY 1983: Soviet Cosmos 1402 crashes into South Atlantic ocean carrying 68 pounds of Uranium-235.
- JANUARY 1978: Cosmos 954 blows up over Canada with 68 pounds of Uranium-235 and other nuclear poisons, much of which is thought to have
vaporized and spread worldwide.
- APRIL 1973: Soviet Rorsat lands in the Pacific Ocean north of Japan. Radiation released from the reactor was detected.
- APRIL 1970: Apollo 13 lands near New Zealand with the 8.3 pounds of Plutonium-238 believed to be still in the spacecraft at the bottom of the
- 1969: Two Cosmos lunar missions fail. Radiation detected as crafts burn up in the atmosphere.
- MAY 1968: U.S. Nimbus B-1 lands in the Santa Barbara channel off California with 4.2 pounds of Uranium-238 but was recovered by NASA.
- APRIL 1964: U.S. Transit 5BN-3 hits the Indian Ocean with its 2.1 pounds of Plutonium-238 vaporizing in the atmosphere and spreading