A month after leaving the hospital following his double lung transplant surgery back in August, three-time Formula 1 champion Niki Lauda has posted a video on the Mercedes F1 team’s social media channels offering congratulations to the team — on which he serves as non-executive chairman  — for its latest championship double, and his appreciation for support he has received in his recovery. The 69-year-old Lauda says he expects to be back at work “soon.”