"It's unbelievable," Hough tells PEOPLE of his wife, who underwent an emergency craniectomy in December 2023 and made her 'Dancing with the Stars' ballroom return on Oct. 15Hayley Erbert Hough's return to the Dancing with the Stars ballroom was an emotional one — and something her husband,

In a pre-dance video package on Tuesday’s show, Hough and Erbert revealed how they came close to suffering the ultimate tragedy. The couple talked to TV Insider and a small group of reporters after the show, sharing that there’s more of their story to be told.

Derek and Hayley Hough have an incredible story of survival to share. The married dancers are working on a documentary that will take a look back at the frightening moment when Erbert collapsed backstage while performing their Symphony of Dance tour in December.