Bart Sibrel asserts that it is technically impossible for the Apollo missions to have reached the moon due to inadequate 1960s computing power and the inability to survive space radiation.

“today with five decades better rockets and computers the farthest that NASA can send an astronaut into space is only 1,000th the distance to the Moon so what they're really claiming Danny is that back in 1969 when all of NASA's computers combined had one millionth the computing power”