Work with animals is a source of suffering to all of us. We treat them like babies who cannot speak. The more time passes, the more I’m sorry about it. We shouldn’t have done it … We did not learn enough from this mission to justify the death of [Laika].
Oleg Gazenko, one of the scientist in charge of the Soviet animals in space program, showing his regret over the dead of Laika in 1998, over 40 years after it, which allegedly haunted him until his passing in 2007.