The soldiers concealed their military identities with help from hospital staff who hid them from Russian forces throughout the occupation.
From: Euromaiden Press BY VIRA KRAVCHUK

Four Ukrainian soldiers walked free this week after hiding in a hospital on Russian-controlled territory for over three years.
The rescue by naval special forces unit “Angels” marks one of the longest documented cases of military personnel surviving in enemy territory.
The operation began when Presidential Commissioner for Military Personnel Rights Olha Reshetylova learned about a Marine Corps serviceman’s twin brother. The marine had been severely wounded during 2022 fighting in eastern Ukraine and ended up in a hospital, where doctors concealedhim from Russian security forces.