How was Kate conceived in 1918 and born in 1979?

Kate’s biological father was hired by the Immari to excavate the Atlantis structure under Gibraltar. He did it in return for Kate’s mother’s hand in marriage. When he unearthed the Bell and unleashed the Spanish Flu Epidemic, Kate’s mother died. He found a room with four tubes. When he discovered they were healing and hibernation pods, he put Kate’s pregnant mother inside where they stayed until 1979, the year Kate was born.