By September 10, search crews had found eight previously unidentified crash sites,[55] some of which were decades old.[56] The urgency of what was still regarded as a rescue mission meant that minimal immediate effort was made to identify the aircraft in the uncharted crash sites,[57] although some had speculated that one could have belonged to Charles Clifford Ogle, missing since 1964.[58] About two dozen aircraft were involved in the massive search, operating from the primary search base at Minden, Nevada, with a secondary search base located at Bishop, California.