RecruitingDevice studyFetal Endoscopic Tracheal Occlusion (FETO) Trial for Congenital Diaphragmatic Hernia (CDH)This is a single site, single arm, non-randomized, pilot trial to assess the feasibility and safety of treating severe congenital diaphragmatic hernia (CDH) with Fetal Endoscopic Tracheal Occlusion (FETO) at Columbia University Irving Medical Center (CUIMC)/ NewYork-Presbyterian Hospital (NYP).