“These are fuel tanks inside Gaza,” the IDF said. “They contain more than 500,000 litres of fuel.” “Hamas-ISIS steals this fuel from civilians and transfers it to its tunnels, rocket launchers, and leaders. This is what Hamas' list of priorities looks like,” Avichay Adraee, the IDF's Arabic spokesman, added.
https://www.telegraph.co.uk/world-news/2023/10/26/hamas-hoarding-fuel-ventilate-gaza-tunnels-israel/