In 1959, he and Sam Doyle were chosen to pilot the Guernica to investigate the Mariana Trench. When they reached the bottom, an alien parasite was able to get into the submarine and infect Sam and Henry. Henry was unsuitable because of the amitriptyline, so it infected Sam and made Henry trap Sam outside. Henry later died of other causes, leaving his body trapped in the Guernica at the bottom of the Mariana Trench. (AUDIO: Submission)