On 11 July 1970, an Athena missile was launched by the U.S. Air Force from Green River, Utah, as part of a routine testing program. The nose cone contained two WO sources of approximately 470 mCi each. The Athena operated abnormally resulting in an impact in Mexico. Through the USAEC, the EG&G Aerial Radiological Measuring System (ARMS) scientific team was asked to participate in the search for the 6 7 C~ using the ARMS gamma radiation detection system. In a period of 3 days, the impact crater was located and the ground recovery team was directed to the site. Various samples were returned to the EG&G Las Vegas laboratory for analysis and identification.

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