<Tr> <Td> </Td> <Td> </Td> <Td> Proton </Td> <Td> 23 April 1968 </Td> <Td> Circumlunar Loop </Td> <Td> non-human biological payload </Td> <Td> Failure--booster malfunction, failed to reach Earth orbit; launch preparation tank explosion kills three in pad crew </Td> </Tr> <Tr> <Td> Zond - 5 </Td> <Td> 5,375 </Td> <Td> Proton </Td> <Td> 15 September 1968 </Td> <Td> Circumlunar Loop </Td> <Td> non-human biological payload </Td> <Td> Success--looped around Moon, returned two tortoises and other live biological specimens and payload safely to Earth despite landing off - target outside the Soviet Union in the Indian Ocean </Td> </Tr> <Tr> <Td> Zond - 6 </Td> <Td> 5,375 </Td> <Td> Proton </Td> <Td> 10 November 1968 </Td> <Td> Circumlunar Loop </Td> <Td> non-human biological payload </Td> <Td> Partial success--looped around Moon, successful reentry, but loss of cabin air pressure caused biological payload death, parachute system malfunction and severe vehicle damage upon landing </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> Proton </Td> <Td> 20 January 1969 </Td> <Td> Circumlunar Loop </Td> <Td> non-human biological payload </Td> <Td> Failure--booster malfunction, failed to reach Earth orbit </Td> </Tr>

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