In the nearly 5-minute clip released Friday, the 24-year-old David is seen in a tunnel with a ceiling roughly as high as he is tall, crossing off dates on a calendar and digging a grave.

In the video, David can be seen crossing off days on a makeshift calendar hung up on the side of an underground Gaza tunnel. Hamas published a video of hostage Evyatar David on Friday evening, which was later cleared for publication by the David Family.