The Israeli military released new information on Tuesday about the six hostages whose bodies were recently discovered in a tunnel in Gaza, including video of the tunnel and details that shed light on the brutal conditions in which they were held.

The hostages appear to have spent the last weeks of their lives in a suffocatingly tight and humid tunnel that was approximately 5.5 feet tall and just 30 to 40 inches wide, Rear Adm. Daniel Hagari, the military’s chief spokesman, said on Tuesday.

When a military forensic team entered the tunnel, in the Tel al-Sultan area of the southern city of Rafah, they found a harrowing scene. Video released by the military on Tuesday showed the cramped space, with bags of supplies and thin mattresses leaning on the concrete walls. Pools of dried blood could be seen on its dirt floor. The New York Times was not able to independently verify the video.

“When you see the blood in the tunnel, it is very, very hard to think also about other hostages being held in those kinds of conditions in many places in Gaza,” said Admiral Hagari. “We are obligated and committed to do everything we can, by all means, to bring back home all the hostages.”

The six hostages found earlier this month were Carmel Gat, 40; Eden Yerushalmi, 24; Hersh Goldberg-Polin, 23; Alexander Lobanov, 32; Almog Sarusi, 27; and Ori Danino, 25.

In addition to the hostages and their captors, the narrow tunnel also held mattresses, clothes and food, including energy bars and cans of tuna, and the military also found an improvised bucket toilet and multiple sacks that held bottles filled with urine, Admiral Hagari said. That led them to believe the hostages were kept in the space “for weeks, not days.”