Mars 2MV-4 No.1 (Sputnik 22)
The Soviet mission Mars 2MV-4 No.1 (Sputnik 22), launched on October 24, 1962, failed in its attempt for a Mars flyby. Although it reached Earth orbit, the 'Blok L' escape stage exploded during the trans-Martian injection attempt, likely due to a lubricant leak in the turbopump.